diff --git a/bot/client.go b/bot/client.go
index c3e7c4c..9f0f479 100644
--- a/bot/client.go
+++ b/bot/client.go
@@ -4,6 +4,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/Tnze/go-mc/bot/path"
 	"github.com/Tnze/go-mc/bot/phy"
 	"github.com/Tnze/go-mc/bot/world"
 	"github.com/Tnze/go-mc/bot/world/entity"
@@ -24,7 +25,7 @@ type Client struct {
 	settings  Settings
 
 	Wd             world.World //the map data
-	Inputs         phy.Inputs
+	Inputs         path.Inputs
 	Physics        phy.State
 	lastPosTx      time.Time
 	justTeleported bool
diff --git a/bot/path/blocks.go b/bot/path/blocks.go
index b6a848f..0f7d42c 100644
--- a/bot/path/blocks.go
+++ b/bot/path/blocks.go
@@ -7,7 +7,7 @@ import (
 
 var (
 	safeStepBlocks = make(map[world.BlockStatus]struct{}, 1024)
-	blocks         = []block.Block{
+	stepBlocks     = []block.Block{
 		block.Stone,
 		block.Granite,
 		block.PolishedGranite,
@@ -34,10 +34,35 @@ var (
 		block.Sandstone,
 		block.RedstoneOre,
 	}
+
+	safeWalkBlocks = make(map[world.BlockStatus]struct{}, 128)
+	walkBlocks     = []block.Block{
+		block.Air,
+		block.Grass,
+		block.Torch,
+		block.OakSign,
+		block.SpruceSign,
+		block.BirchSign,
+		block.AcaciaSign,
+		block.JungleSign,
+		block.DarkOakSign,
+		block.OakWallSign,
+		block.SpruceWallSign,
+		block.BirchWallSign,
+		block.AcaciaWallSign,
+		block.JungleWallSign,
+		block.DarkOakWallSign,
+		block.Cornflower,
+	}
+
+	additionalCostBlocks = map[*block.Block]int{
+		&block.Rail:        120,
+		&block.PoweredRail: 200,
+	}
 )
 
 func init() {
-	for _, b := range blocks {
+	for _, b := range stepBlocks {
 		if b.MinStateID == b.MaxStateID {
 			safeStepBlocks[world.BlockStatus(b.MinStateID)] = struct{}{}
 		} else {
@@ -46,4 +71,24 @@ func init() {
 			}
 		}
 	}
+
+	for _, b := range walkBlocks {
+		if b.MinStateID == b.MaxStateID {
+			safeWalkBlocks[world.BlockStatus(b.MinStateID)] = struct{}{}
+		} else {
+			for i := b.MinStateID; i <= b.MaxStateID; i++ {
+				safeWalkBlocks[world.BlockStatus(i)] = struct{}{}
+			}
+		}
+	}
+}
+
+func SteppableBlock(bID world.BlockStatus) bool {
+	_, ok := safeStepBlocks[bID]
+	return ok
+}
+
+func AirLikeBlock(bID world.BlockStatus) bool {
+	_, ok := safeWalkBlocks[bID]
+	return ok
 }
diff --git a/bot/phy/inputs.go b/bot/path/inputs.go
similarity index 84%
rename from bot/phy/inputs.go
rename to bot/path/inputs.go
index a4b853c..2190ada 100644
--- a/bot/phy/inputs.go
+++ b/bot/path/inputs.go
@@ -1,8 +1,10 @@
-package phy
+package path
 
 // Inputs describes the desired movements of the player.
 type Inputs struct {
 	Yaw, Pitch float64
 
 	ThrottleX, ThrottleZ float64
+
+	Jump bool
 }
diff --git a/bot/path/movement.go b/bot/path/movement.go
new file mode 100644
index 0000000..dc37b00
--- /dev/null
+++ b/bot/path/movement.go
@@ -0,0 +1,179 @@
+package path
+
+// Movement represents a single type of movement in a path.
+type Movement uint8
+
+var allMovements = []Movement{TraverseNorth, TraverseSouth, TraverseEast, TraverseWest,
+	TraverseNorthWest, TraverseNorthEast, TraverseSouthWest, TraverseSouthEast,
+	DropNorth, DropSouth, DropEast, DropWest,
+	AscendNorth, AscendSouth, AscendEast, AscendWest,
+}
+
+// Valid movement values.
+const (
+	Waypoint Movement = iota
+	TraverseNorth
+	TraverseSouth
+	TraverseEast
+	TraverseWest
+	TraverseNorthEast
+	TraverseNorthWest
+	TraverseSouthEast
+	TraverseSouthWest
+	DropNorth
+	DropSouth
+	DropEast
+	DropWest
+	AscendNorth
+	AscendSouth
+	AscendEast
+	AscendWest
+)
+
+func (m Movement) Possible(nav *Nav, x, y, z int, from V3) bool {
+	// fmt.Printf("%s.Possible(%d,%d,%d)\n", m, x, y, z)
+	switch m {
+	case Waypoint, TraverseNorth, TraverseSouth, TraverseEast, TraverseWest:
+		if !SteppableBlock(nav.World.GetBlockStatus(x, y, z)) {
+			return false
+		}
+		return AirLikeBlock(nav.World.GetBlockStatus(x, y+1, z)) && AirLikeBlock(nav.World.GetBlockStatus(x, y+2, z))
+
+	case TraverseNorthWest, TraverseNorthEast, TraverseSouthWest, TraverseSouthEast:
+		if !SteppableBlock(nav.World.GetBlockStatus(x, y, z)) {
+			return false
+		}
+		if !AirLikeBlock(nav.World.GetBlockStatus(x, y+1, z)) || !AirLikeBlock(nav.World.GetBlockStatus(x, y+2, z)) {
+			return false
+		}
+		if !AirLikeBlock(nav.World.GetBlockStatus(from.X, y+1, z)) || !AirLikeBlock(nav.World.GetBlockStatus(from.X, y+2, z)) {
+			return false
+		}
+		return AirLikeBlock(nav.World.GetBlockStatus(x, y+1, from.Z)) && AirLikeBlock(nav.World.GetBlockStatus(x, y+2, from.Z))
+
+	case DropNorth, DropSouth, DropEast, DropWest:
+		for amt := 0; amt < 3; amt++ {
+			if !AirLikeBlock(nav.World.GetBlockStatus(x, y+amt+1, z)) {
+				return false
+			}
+		}
+		return SteppableBlock(nav.World.GetBlockStatus(x, y, z))
+
+	case AscendNorth, AscendSouth, AscendEast, AscendWest:
+		if !AirLikeBlock(nav.World.GetBlockStatus(x, y+1, z)) || !AirLikeBlock(nav.World.GetBlockStatus(x, y+2, z)) {
+			return false
+		}
+		return SteppableBlock(nav.World.GetBlockStatus(x, y, z)) &&
+			AirLikeBlock(nav.World.GetBlockStatus(from.X, from.Y+1, from.Z)) &&
+			AirLikeBlock(nav.World.GetBlockStatus(from.X, from.Y+2, from.Z))
+
+	default:
+		panic(m)
+	}
+}
+
+func (m Movement) Offset() (x, y, z int) {
+	switch m {
+	case Waypoint:
+		return 0, 0, 0
+	case TraverseNorth:
+		return 0, 0, -1
+	case TraverseSouth:
+		return 0, 0, 1
+	case TraverseEast:
+		return 1, 0, 0
+	case TraverseWest:
+		return -1, 0, 0
+
+	case DropNorth:
+		return 0, -1, -1
+	case DropSouth:
+		return 0, -1, 1
+	case DropEast:
+		return 1, -1, 0
+	case DropWest:
+		return -1, -1, 0
+	case AscendNorth:
+		return 0, 1, -1
+	case AscendSouth:
+		return 0, 1, 1
+	case AscendEast:
+		return 1, 1, 0
+	case AscendWest:
+		return -1, 1, 0
+
+	case TraverseNorthWest:
+		return -1, 0, -1
+	case TraverseNorthEast:
+		return 1, 0, -1
+	case TraverseSouthWest:
+		return -1, 0, 1
+	case TraverseSouthEast:
+		return 1, 0, 1
+
+	default:
+		panic(m)
+	}
+}
+
+func (m Movement) BaseCost() float64 {
+	switch m {
+	case Waypoint:
+		return 0
+	case TraverseNorth, TraverseSouth, TraverseEast, TraverseWest:
+		return 1
+	case TraverseNorthWest, TraverseNorthEast, TraverseSouthWest, TraverseSouthEast:
+		return 1.5
+
+	case DropNorth, DropSouth, DropEast, DropWest:
+		return 2
+	case AscendNorth, AscendSouth, AscendEast, AscendWest:
+		return 2.25
+	default:
+		panic(m)
+	}
+}
+
+func (m Movement) String() string {
+	switch m {
+	case Waypoint:
+		return "waypoint"
+	case TraverseNorth:
+		return "traverse-north"
+	case TraverseSouth:
+		return "traverse-south"
+	case TraverseEast:
+		return "traverse-east"
+	case TraverseWest:
+		return "traverse-west"
+
+	case DropNorth:
+		return "drop-north"
+	case DropSouth:
+		return "drop-south"
+	case DropEast:
+		return "drop-east"
+	case DropWest:
+		return "drop-west"
+
+	case AscendNorth:
+		return "jump-north"
+	case AscendSouth:
+		return "jump-south"
+	case AscendEast:
+		return "jump-east"
+	case AscendWest:
+		return "jump-west"
+
+	case TraverseNorthWest:
+		return "traverse-northwest"
+	case TraverseNorthEast:
+		return "traverse-northeast"
+	case TraverseSouthWest:
+		return "traverse-southwest"
+	case TraverseSouthEast:
+		return "traverse-southeast"
+	default:
+		panic(m)
+	}
+}
diff --git a/bot/path/path.go b/bot/path/path.go
index d55b9c1..06c39fa 100644
--- a/bot/path/path.go
+++ b/bot/path/path.go
@@ -2,8 +2,9 @@
 package path
 
 import (
+	"math"
+
 	"github.com/Tnze/go-mc/bot/world"
-	"github.com/Tnze/go-mc/data/block"
 	"github.com/beefsack/go-astar"
 )
 
@@ -36,27 +37,14 @@ func (n *Nav) Path() (path []astar.Pather, distance float64, found bool) {
 		})
 }
 
-// Movement represents a single type of movement in a path.
-type Movement uint8
-
-var allMovements = []Movement{TraverseNorth, TraverseSouth, TraverseEast, TraverseWest}
-
-// Valid movement values.
-const (
-	Waypoint Movement = iota
-	TraverseNorth
-	TraverseSouth
-	TraverseEast
-	TraverseWest
-)
-
 // Tile represents a point in a path. All tiles in a path are adjaceent their
 // preceeding tiles.
 type Tile struct {
 	Nav *Nav
 
-	Movement Movement
-	Pos      V3
+	Movement  Movement
+	Pos       V3
+	ExtraCost int
 }
 
 func (t Tile) PathNeighborCost(to astar.Pather) float64 {
@@ -67,12 +55,17 @@ func (t Tile) PathNeighborCost(to astar.Pather) float64 {
 func (t Tile) PathEstimatedCost(to astar.Pather) float64 {
 	other := to.(Tile)
 	cost := t.Pos.Cost(other.Pos)
+
 	return cost + other.Movement.BaseCost()
 }
 
 func (t Tile) PathNeighbors() []astar.Pather {
 	possibles := make([]astar.Pather, 0, 8)
 
+	if t.PathEstimatedCost(Tile{Pos: t.Nav.Start}) > 1200 {
+		return nil
+	}
+
 	if t.Pos == t.Nav.Dest && t.Movement != Waypoint {
 		dupe := t
 		dupe.Movement = Waypoint
@@ -82,7 +75,7 @@ func (t Tile) PathNeighbors() []astar.Pather {
 	for _, m := range allMovements {
 		x, y, z := m.Offset()
 		pos := V3{X: t.Pos.X + x, Y: t.Pos.Y + y, Z: t.Pos.Z + z}
-		if m.Possible(t.Nav, pos.X, pos.Y, pos.Z) {
+		if m.Possible(t.Nav, pos.X, pos.Y, pos.Z, t.Pos) {
 			possibles = append(possibles, Tile{
 				Nav:      t.Nav,
 				Movement: m,
@@ -95,63 +88,18 @@ func (t Tile) PathNeighbors() []astar.Pather {
 	return possibles
 }
 
-func (m Movement) Possible(nav *Nav, x, y, z int) bool {
-	// fmt.Printf("%s.Possible(%d,%d,%d)\n", m, x, y, z)
-	switch m {
-	case Waypoint, TraverseNorth, TraverseSouth, TraverseEast, TraverseWest:
-		b := nav.World.GetBlockStatus(x, y, z)
-		if _, safe := safeStepBlocks[b]; !safe {
-			return false
-		}
-		above1 := uint32(nav.World.GetBlockStatus(x, y+1, z))
-		above2 := uint32(nav.World.GetBlockStatus(x, y+2, z))
-		return above1 == block.Air.MinStateID && above2 == block.Air.MinStateID
-	default:
-		panic(m)
+func (t Tile) Inputs(dX, dY, dZ float64) Inputs {
+	// Sufficient for simple movements.
+	at := math.Atan2(-dX, -dZ)
+	out := Inputs{
+		ThrottleX: math.Sin(at),
+		ThrottleZ: math.Cos(at),
 	}
-}
 
-func (m Movement) Offset() (x, y, z int) {
-	switch m {
-	case Waypoint:
-		return 0, 0, 0
-	case TraverseNorth:
-		return 0, 0, -1
-	case TraverseSouth:
-		return 0, 0, 1
-	case TraverseEast:
-		return 1, 0, 0
-	case TraverseWest:
-		return -1, 0, 0
-	default:
-		panic(m)
-	}
-}
-
-func (m Movement) BaseCost() float64 {
-	switch m {
-	case Waypoint:
-		return 0
-	case TraverseNorth, TraverseSouth, TraverseEast, TraverseWest:
-		return 1
-	default:
-		panic(m)
-	}
-}
-
-func (m Movement) String() string {
-	switch m {
-	case Waypoint:
-		return "waypoint"
-	case TraverseNorth:
-		return "traverse-north"
-	case TraverseSouth:
-		return "traverse-south"
-	case TraverseEast:
-		return "traverse-east"
-	case TraverseWest:
-		return "traverse-west"
-	default:
-		panic(m)
+	switch t.Movement {
+	case AscendNorth, AscendSouth, AscendEast, AscendWest:
+		out.Jump = math.Sqrt(dX*dX+dZ*dZ) < 1.75
+		out.Yaw = 0
 	}
+	return out
 }
diff --git a/bot/phy/phy.go b/bot/phy/phy.go
index 3d97490..6953f14 100644
--- a/bot/phy/phy.go
+++ b/bot/phy/phy.go
@@ -5,6 +5,7 @@ package phy
 import (
 	"math"
 
+	"github.com/Tnze/go-mc/bot/path"
 	"github.com/Tnze/go-mc/bot/world"
 	"github.com/Tnze/go-mc/bot/world/entity/player"
 )
@@ -17,6 +18,9 @@ const (
 	maxYawChange   = 33
 	maxPitchChange = 11
 
+	stepHeight   = 0.6
+	minJumpTicks = 14
+
 	gravity      = 0.08
 	drag         = 0.98
 	acceleration = 0.02
@@ -43,6 +47,7 @@ type State struct {
 	Pos        Point
 	Vel        Point
 	Yaw, Pitch float64
+	lastJump   uint32
 
 	// player state flags.
 	onGround  bool
@@ -51,7 +56,8 @@ type State struct {
 		horizontal bool
 	}
 
-	Run bool
+	tick uint32
+	Run  bool
 }
 
 func (s *State) ServerPositionUpdate(player player.Pos, w World) error {
@@ -79,7 +85,7 @@ func (s *State) surroundings(query AABB, w World) Surrounds {
 	for y := minY; y < maxY; y++ {
 		for z := minZ; z < maxZ; z++ {
 			for x := minX; x < maxX; x++ {
-				if block := w.GetBlockStatus(x, y, z); block > 0 {
+				if block := w.GetBlockStatus(x, y, z); !path.AirLikeBlock(block) {
 					out = append(out, AABB{X: MinMax{Max: 1}, Y: MinMax{Max: 1}, Z: MinMax{Max: 1}, Block: block}.Offset(float64(x), float64(y), float64(z)))
 				}
 			}
@@ -88,89 +94,6 @@ func (s *State) surroundings(query AABB, w World) Surrounds {
 	return out
 }
 
-func (s *State) applyLookInputs(input Inputs) {
-	errYaw := math.Min(math.Max(input.Yaw-s.Yaw, -maxYawChange), maxYawChange)
-	s.Yaw += errYaw
-	errPitch := math.Min(math.Max(input.Pitch-s.Pitch, -maxPitchChange), maxPitchChange)
-	s.Pitch += errPitch
-}
-
-func (s *State) applyPosInputs(input Inputs, acceleration, inertia float64) {
-	speed := math.Sqrt(input.ThrottleX*input.ThrottleX + input.ThrottleZ*input.ThrottleZ)
-	if speed < 0.01 {
-		return
-	}
-	speed = acceleration / math.Max(speed, 1)
-
-	input.ThrottleX *= speed
-	input.ThrottleZ *= speed
-
-	s.Vel.X += input.ThrottleX
-	s.Vel.Z += input.ThrottleZ
-}
-
-func (s *State) Tick(input Inputs, w World) error {
-	if !s.Run {
-		return nil
-	}
-	var inertia = inertia
-	var acceleration = acceleration
-	if s.onGround {
-		inertia *= slipperiness
-		acceleration = 0.1 * (0.1627714 / (inertia * inertia * inertia))
-	}
-	s.applyLookInputs(input)
-	s.applyPosInputs(input, acceleration, inertia)
-
-	// Deadzone velocities when they get too low.
-	if math.Abs(s.Vel.X) < resetVel {
-		s.Vel.X = 0
-	}
-	if math.Abs(s.Vel.Y) < resetVel {
-		s.Vel.Y = 0
-	}
-	if math.Abs(s.Vel.Z) < resetVel {
-		s.Vel.Z = 0
-	}
-	// Gravity
-	s.Vel.Y -= gravity
-	// Drag & friction.
-	s.Vel.Y *= drag
-	s.Vel.X *= inertia
-	s.Vel.Z *= inertia
-
-	// Apply collision.
-	var (
-		player       = s.BB()
-		query        = player.Extend(s.Vel.X, s.Vel.Y, s.Vel.Z)
-		surroundings = s.surroundings(query, w)
-		newVel       = s.Vel
-	)
-	for _, b := range surroundings {
-		newVel.Y = b.YOffset(player, newVel.Y)
-	}
-	player = player.Offset(0, newVel.Y, 0)
-	for _, b := range surroundings {
-		newVel.X = b.XOffset(player, newVel.X)
-	}
-	player = player.Offset(newVel.X, 0, 0)
-	for _, b := range surroundings {
-		newVel.Z = b.ZOffset(player, newVel.Z)
-	}
-	player = player.Offset(0, 0, newVel.Z)
-
-	// Update flags.
-	s.Pos.X = player.X.Min + playerWidth/2
-	s.Pos.Y = player.Y.Min
-	s.Pos.Z = player.Z.Min + playerWidth/2
-	s.collision.horizontal = newVel.X != s.Vel.X || newVel.Z != s.Vel.Z
-	s.collision.vertical = newVel.Y != s.Vel.Y
-	s.onGround = s.collision.vertical && s.Vel.Y < 0
-
-	s.Vel = newVel
-	return nil
-}
-
 func (s *State) BB() AABB {
 	return AABB{
 		X: MinMax{Min: -playerWidth / 2, Max: playerWidth / 2},
@@ -186,3 +109,114 @@ func (s *State) Position() player.Pos {
 		OnGround: s.onGround,
 	}
 }
+
+func (s *State) Tick(input path.Inputs, w World) error {
+	s.tick++
+	if !s.Run {
+		return nil
+	}
+	s.tickVelocity(input, w)
+
+	player, newVel := s.computeCollision(s.BB(), s.BB().Extend(s.Vel.X, s.Vel.Y, s.Vel.Z), w)
+
+	bb := player.Extend(s.Vel.X, stepHeight, s.Vel.Z)
+	surroundings := s.surroundings(bb, w)
+	y := float64(0)
+	for _, b := range surroundings {
+		if b.Intersects(bb) && bb.Y.Max > b.Y.Min {
+			y = math.Max(y, b.Y.Max)
+		}
+	}
+	//fmt.Printf("pY = %.2f, maxblockY = %.1f (delta = %.1f)\n", bb.Y.Min, y, bb.Y.Min-y)
+	if d := bb.Y.Min - y; d >= -stepHeight && d < stepHeight-1 {
+		bb := player.Offset(0, stepHeight, 0)
+		player, newVel = s.computeCollision(bb, bb.Extend(s.Vel.X, s.Vel.Y, s.Vel.Z), w)
+	}
+
+	// Update flags.
+	s.Pos.X = player.X.Min + playerWidth/2
+	s.Pos.Y = player.Y.Min
+	s.Pos.Z = player.Z.Min + playerWidth/2
+	s.collision.horizontal = newVel.X != s.Vel.X || newVel.Z != s.Vel.Z
+	s.collision.vertical = newVel.Y != s.Vel.Y
+	s.onGround = s.collision.vertical && s.Vel.Y < 0
+
+	s.Vel = newVel
+	return nil
+}
+
+func (s *State) applyLookInputs(input path.Inputs) {
+	errYaw := math.Min(math.Max(input.Yaw-s.Yaw, -maxYawChange), maxYawChange)
+	s.Yaw += errYaw
+	errPitch := math.Min(math.Max(input.Pitch-s.Pitch, -maxPitchChange), maxPitchChange)
+	s.Pitch += errPitch
+}
+
+func (s *State) applyPosInputs(input path.Inputs, acceleration, inertia float64) {
+	// fmt.Println(input.Jump, s.lastJump, s.onGround)
+	if input.Jump && s.lastJump+minJumpTicks < s.tick {
+		s.lastJump = s.tick
+		s.Vel.Y += 0.42
+	}
+
+	speed := math.Sqrt(input.ThrottleX*input.ThrottleX + input.ThrottleZ*input.ThrottleZ)
+	if speed < 0.01 {
+		return
+	}
+	speed = acceleration / math.Max(speed, 1)
+
+	input.ThrottleX *= speed
+	input.ThrottleZ *= speed
+
+	s.Vel.X += input.ThrottleX
+	s.Vel.Z += input.ThrottleZ
+}
+
+func (s *State) tickVelocity(input path.Inputs, w World) {
+	var inertia = inertia
+	var acceleration = acceleration
+	if below := w.GetBlockStatus(int(math.Floor(s.Pos.X)), int(math.Floor(s.Pos.Y))-1, int(math.Floor(s.Pos.Z))); s.onGround && !path.AirLikeBlock(below) {
+		inertia *= slipperiness
+		acceleration = 0.1 * (0.1627714 / (inertia * inertia * inertia))
+	}
+
+	// Deadzone velocities when they get too low.
+	if math.Abs(s.Vel.X) < resetVel {
+		s.Vel.X = 0
+	}
+	if math.Abs(s.Vel.Y) < resetVel {
+		s.Vel.Y = 0
+	}
+	if math.Abs(s.Vel.Z) < resetVel {
+		s.Vel.Z = 0
+	}
+
+	s.applyLookInputs(input)
+	s.applyPosInputs(input, acceleration, inertia)
+
+	// Gravity
+	s.Vel.Y -= gravity
+	// Drag & friction.
+	s.Vel.Y *= drag
+	s.Vel.X *= inertia
+	s.Vel.Z *= inertia
+}
+
+func (s *State) computeCollision(bb, query AABB, w World) (outBB AABB, outVel Point) {
+	surroundings := s.surroundings(query, w)
+	outVel = s.Vel
+
+	for _, b := range surroundings {
+		outVel.Y = b.YOffset(bb, outVel.Y)
+	}
+	bb = bb.Offset(0, outVel.Y, 0)
+	for _, b := range surroundings {
+		outVel.X = b.XOffset(bb, outVel.X)
+	}
+	bb = bb.Offset(outVel.X, 0, 0)
+	for _, b := range surroundings {
+		outVel.Z = b.ZOffset(bb, outVel.Z)
+	}
+	bb = bb.Offset(0, 0, outVel.Z)
+	return bb, outVel
+}