diff --git a/assets/wallpapers/test-128x128.png b/assets/wallpapers/test-128x128.png
new file mode 100644
index 0000000..736302d
Binary files /dev/null and b/assets/wallpapers/test-128x128.png differ
diff --git a/balance/debug.go b/balance/debug.go
index 1d630ab..9e55043 100644
--- a/balance/debug.go
+++ b/balance/debug.go
@@ -16,11 +16,11 @@ var (
 	 ***************/
 
 	// Debug overlay (FPS etc.) settings.
-	DebugFontFilename       = "./fonts/DejaVuSans-Bold.ttf"
-	DebugFontSize           = 15
-	DebugLabelColor         = render.MustHexColor("#FF9900")
-	DebugValueColor         = render.MustHexColor("#00CCFF")
-	DebugStrokeDarken int32 = 80
+	DebugFontFilename = "./fonts/DejaVuSans.ttf"
+	DebugFontSize     = 16
+	DebugLabelColor   = render.MustHexColor("#FF9900")
+	DebugValueColor   = render.MustHexColor("#00CCFF")
+	DebugStrokeDarken = 80
 
 	// Background color to use when exporting a drawing Chunk as a bitmap image
 	// on disk. Default is white. Setting this to translucent yellow is a great
diff --git a/balance/numbers.go b/balance/numbers.go
index 7305b8f..14ee9f6 100644
--- a/balance/numbers.go
+++ b/balance/numbers.go
@@ -15,8 +15,9 @@ var (
 	ScrollMaxVelocity = 24
 
 	// Player speeds
-	PlayerMaxVelocity = 12
-	Gravity           = 2
+	PlayerMaxVelocity  = 12
+	PlayerAcceleration = 2 // pixels / second / second
+	Gravity            = 2
 
 	// Default chunk size for canvases.
 	ChunkSize = 128
diff --git a/commands.go b/commands.go
index d3d314a..095bd5e 100644
--- a/commands.go
+++ b/commands.go
@@ -22,6 +22,17 @@ func (c Command) Run(d *Doodle) error {
 		return nil
 	}
 
+	// Cheats :P
+	if c.Raw == "unleash the beast" {
+		if fpsDoNotCap {
+			d.Flash("Reset frame rate throttle to factory default %d FPS", TargetFPS)
+		} else {
+			d.Flash("Unleashing as many frames as we can render!")
+		}
+		fpsDoNotCap = !fpsDoNotCap
+		return nil
+	}
+
 	switch c.Command {
 	case "echo":
 		d.Flash(c.ArgsLiteral)
diff --git a/doodads/actor.go b/doodads/actor.go
index 15f2191..2a77289 100644
--- a/doodads/actor.go
+++ b/doodads/actor.go
@@ -14,6 +14,8 @@ type Actor interface {
 	Position() render.Point
 	Velocity() render.Point
 	SetVelocity(render.Point)
+	Acceleration() int
+	SetAcceleration(int)
 	Size() render.Rect
 	Grounded() bool
 	SetGrounded(bool)
diff --git a/doodads/collision.go b/doodads/collision.go
index 739a7ad..fe8b264 100644
--- a/doodads/collision.go
+++ b/doodads/collision.go
@@ -96,8 +96,15 @@ const (
 	Right
 )
 
-// CollidesWithGrid checks if a Doodad collides with level geometry.
-func CollidesWithGrid(d Actor, grid *level.Chunker, target render.Point) (*Collide, bool) {
+/*
+CollidesWithGrid checks if a Doodad collides with level geometry.
+
+The `target` is the point the actor wants to move to this tick.
+
+The `scroll` is the scroll offset of the canvas that is viewing the grid, so
+that collision geometry can be offset properly on screen.
+*/
+func CollidesWithGrid(d Actor, grid *level.Chunker, target render.Point, scroll render.Point) (*Collide, bool) {
 	var (
 		P = d.Position()
 		S = d.Size()
@@ -109,14 +116,14 @@ func CollidesWithGrid(d Actor, grid *level.Chunker, target render.Point) (*Colli
 		capHeight int32 // Stop vertical movement thru a ceiling
 		capLeft   int32 // Stop movement thru a wall
 		capRight  int32
-		hitLeft   bool // Has hit an obstacle on the left
-		hitRight  bool // or right
-		hitFloor  bool
-		capFloor  int32
+		capFloor  int32 // Stop movement thru the floor
+		hitLeft   bool  // Has hit an obstacle on the left
+		hitRight  bool  // or right
+		hitFloor  bool  // or floor
 	)
 
 	// Test all of the bounding boxes for a collision with level geometry.
-	if ok := result.ScanBoundingBox(GetBoundingRect(d), grid); ok {
+	if ok := result.ScanBoundingBox(GetBoundingRect(d).SubtractPoint(scroll), grid); ok {
 		// We've already collided! Try to wiggle free.
 		if result.Bottom {
 			if !d.Grounded() {
@@ -190,7 +197,7 @@ func CollidesWithGrid(d Actor, grid *level.Chunker, target render.Point) (*Colli
 			Y: point.Y,
 			W: S.W,
 			H: S.H,
-		}, grid); has {
+		}.SubtractPoint(scroll), grid); has {
 			if result.Bottom {
 				if !hitFloor {
 					hitFloor = true
diff --git a/doodads/drawing.go b/doodads/drawing.go
index 35c5c63..99837c0 100644
--- a/doodads/drawing.go
+++ b/doodads/drawing.go
@@ -12,6 +12,7 @@ type Drawing struct {
 	id       string
 	point    render.Point
 	velocity render.Point
+	accel    int
 	size     render.Rect
 	grounded bool
 }
@@ -49,6 +50,16 @@ func (d *Drawing) SetVelocity(v render.Point) {
 	d.velocity = v
 }
 
+// Acceleration returns the Drawing's acceleration.
+func (d *Drawing) Acceleration() int {
+	return d.accel
+}
+
+// SetAcceleration to set the acceleration.
+func (d *Drawing) SetAcceleration(v int) {
+	d.accel = v
+}
+
 // Size returns the Drawing's size.
 func (d *Drawing) Size() render.Rect {
 	return d.size
diff --git a/doodle.go b/doodle.go
index a437fd8..268c5a6 100644
--- a/doodle.go
+++ b/doodle.go
@@ -15,7 +15,7 @@ import (
 
 const (
 	// Version number.
-	Version = "0.0.1-alpha"
+	Version = "0.0.7-alpha"
 
 	// TargetFPS is the frame rate to cap the game to.
 	TargetFPS = 1000 / 60 // 60 FPS
@@ -148,13 +148,15 @@ func (d *Doodle) Run() error {
 		}
 
 		// Delay to maintain the target frames per second.
-		elapsed := time.Now().Sub(start)
-		tmp := elapsed / time.Millisecond
 		var delay uint32
-		if TargetFPS-int(tmp) > 0 { // make sure it won't roll under
-			delay = uint32(TargetFPS - int(tmp))
+		if !fpsDoNotCap {
+			elapsed := time.Now().Sub(start)
+			tmp := elapsed / time.Millisecond
+			if TargetFPS-int(tmp) > 0 { // make sure it won't roll under
+				delay = uint32(TargetFPS - int(tmp))
+			}
+			d.Engine.Delay(delay)
 		}
-		d.Engine.Delay(delay)
 
 		// Track how long this frame took to measure FPS over time.
 		d.TrackFPS(delay)
diff --git a/fps.go b/fps.go
index 57f2193..4de911a 100644
--- a/fps.go
+++ b/fps.go
@@ -33,6 +33,7 @@ var (
 	fpsFrames       int
 	fpsSkipped      uint32
 	fpsInterval     uint32 = 1000
+	fpsDoNotCap     bool   // remove the FPS delay cap in Main Loop
 
 	// Custom labels for scenes to add to the debug overlay view.
 	customDebugLabels []debugLabel
@@ -49,17 +50,22 @@ func (d *Doodle) DrawDebugOverlay() {
 		return
 	}
 
+	var framesSkipped = fmt.Sprintf("(skip: %dms)", fpsSkipped)
+	if fpsDoNotCap {
+		framesSkipped = "uncapped"
+	}
+
 	var (
 		darken        = balance.DebugStrokeDarken
 		Yoffset int32 = 20 // leave room for the menu bar
-		Xoffset int32 = 5
+		Xoffset int32 = 20
 		keys          = []string{
 			"FPS:",
 			"Scene:",
 			"Mouse:",
 		}
 		values = []string{
-			fmt.Sprintf("%d   (skip: %dms)", fpsCurrent, fpsSkipped),
+			fmt.Sprintf("%d   %s", fpsCurrent, framesSkipped),
 			d.Scene.Name(),
 			fmt.Sprintf("%d,%d", d.event.CursorX.Now, d.event.CursorY.Now),
 		}
diff --git a/pkg/wallpaper/wallpaper_test.go b/pkg/wallpaper/wallpaper_test.go
index 72d3c1e..4efcecf 100644
--- a/pkg/wallpaper/wallpaper_test.go
+++ b/pkg/wallpaper/wallpaper_test.go
@@ -28,7 +28,7 @@ func TestWallpaper(t *testing.T) {
 		img := image.NewRGBA(image.Rect(0, 0, width, height))
 		draw.Draw(
 			// Corner: red
-			img, // dst Image
+			img,                               // dst Image
 			image.Rect(0, 0, qWidth, qHeight), // r Rectangle
 			image.NewUniform(red),             // src Image
 			image.Point{0, 0},                 // sp Point
diff --git a/play_scene.go b/play_scene.go
index bf6546c..c1cf8bb 100644
--- a/play_scene.go
+++ b/play_scene.go
@@ -173,7 +173,7 @@ func (s *PlayScene) movePlayer(ev *events.State) {
 	// Apply gravity.
 	// var onFloor bool
 
-	info, ok := doodads.CollidesWithGrid(s.Player, s.Level.Chunker, delta)
+	info, ok := doodads.CollidesWithGrid(s.Player, s.Level.Chunker, delta, s.drawing.Scroll)
 	if ok {
 		// Collision happened with world.
 	}
diff --git a/render/color.go b/render/color.go
index c16cda2..f953e49 100644
--- a/render/color.go
+++ b/render/color.go
@@ -156,15 +156,15 @@ func (c *Color) UnmarshalJSON(b []byte) error {
 }
 
 // Add a relative color value to the color.
-func (c Color) Add(r, g, b, a int32) Color {
+func (c Color) Add(r, g, b, a int) Color {
 	var (
-		R = int32(c.Red) + r
-		G = int32(c.Green) + g
-		B = int32(c.Blue) + b
-		A = int32(c.Alpha) + a
+		R = int(c.Red) + r
+		G = int(c.Green) + g
+		B = int(c.Blue) + b
+		A = int(c.Alpha) + a
 	)
 
-	cap8 := func(v int32) uint8 {
+	cap8 := func(v int) uint8 {
 		if v > 255 {
 			v = 255
 		} else if v < 0 {
@@ -182,11 +182,22 @@ func (c Color) Add(r, g, b, a int32) Color {
 }
 
 // Lighten a color value.
-func (c Color) Lighten(v int32) Color {
+func (c Color) Lighten(v int) Color {
 	return c.Add(v, v, v, 0)
 }
 
 // Darken a color value.
-func (c Color) Darken(v int32) Color {
+func (c Color) Darken(v int) Color {
 	return c.Add(-v, -v, -v, 0)
 }
+
+// Transparentize adjusts the alpha level of a color.
+func (c Color) Transparentize(v int) Color {
+	return c.Add(0, 0, 0, int(v))
+}
+
+// SetAlpha sets the alpha value to a specific setting.
+func (c Color) SetAlpha(v uint8) Color {
+	c.Alpha = v
+	return c
+}
diff --git a/render/interface.go b/render/interface.go
index 1a30ad9..a64d498 100644
--- a/render/interface.go
+++ b/render/interface.go
@@ -125,7 +125,8 @@ func (r Rect) Add(other Rect) Rect {
 	}
 }
 
-// Add a point to move the rect.
+// Add (or subtract) a point to move the rect. This is usually the method you
+// want to use: negative Point values will subtract the rect's position.
 func (r Rect) AddPoint(other Point) Rect {
 	return Rect{
 		X: r.X + other.X,
@@ -135,6 +136,17 @@ func (r Rect) AddPoint(other Point) Rect {
 	}
 }
 
+// SubtractPoint is the inverse of AddPoint. Use this only if you need to
+// invert the Point being added.
+func (r Rect) SubtractPoint(other Point) Rect {
+	return Rect{
+		X: r.X - other.X,
+		Y: r.Y - other.Y,
+		W: r.W,
+		H: r.H,
+	}
+}
+
 // Text holds information for drawing text.
 type Text struct {
 	Text         string
diff --git a/render/point.go b/render/point.go
index 272238c..49f8576 100644
--- a/render/point.go
+++ b/render/point.go
@@ -69,12 +69,21 @@ func (p Point) Inside(r Rect) bool {
 		(p.Y >= y1 && p.Y <= y2))
 }
 
-// Add (or subtract) the other point to your current point.
+// Add (or subtract) the other point to your current point. This is usually
+// the one you want: if the other Point has negative values it will subtract
+// them from this Point, or if they are positive it will add them.
 func (p *Point) Add(other Point) {
 	p.X += other.X
 	p.Y += other.Y
 }
 
+// Subtract is the inverse of Add. Use this if you want to force a subtraction
+// operation (i.e. to invert a Point before adding it).
+func (p *Point) Subtract(other Point) {
+	p.X -= other.X
+	p.Y -= other.Y
+}
+
 // MarshalText to convert the point into text so that a render.Point may be used
 // as a map key and serialized to JSON.
 func (p *Point) MarshalText() ([]byte, error) {
diff --git a/render/sdl/fps.go b/render/sdl/fps.go
deleted file mode 100644
index 4c625c9..0000000
--- a/render/sdl/fps.go
+++ /dev/null
@@ -1,22 +0,0 @@
-package sdl
-
-import (
-	"git.kirsle.net/apps/doodle/level"
-)
-
-// Frames to cache for FPS calculation.
-const (
-	maxSamples = 100
-	TargetFPS  = 1000 / 60
-)
-
-var (
-	fpsCurrentTicks uint32 // current time we get sdl.GetTicks()
-	fpsLastTime     uint32 // last time we printed the fpsCurrentTicks
-	fpsCurrent      int
-	fpsFrames       int
-	fpsSkipped      uint32
-	fpsInterval     uint32 = 1000
-)
-
-var pixelHistory []level.Pixel
diff --git a/ui/theme/theme.go b/ui/theme/theme.go
index 23c3186..1994128 100644
--- a/ui/theme/theme.go
+++ b/ui/theme/theme.go
@@ -8,5 +8,5 @@ var (
 	ButtonHoverColor      = render.RGBA(200, 255, 255, 255)
 	ButtonOutlineColor    = render.Black
 
-	BorderColorOffset int32 = 40
+	BorderColorOffset = 40
 )
diff --git a/uix/canvas_scrolling.go b/uix/canvas_scrolling.go
index 3c5f506..7c13aff 100644
--- a/uix/canvas_scrolling.go
+++ b/uix/canvas_scrolling.go
@@ -127,7 +127,7 @@ func (w *Canvas) loopFollowActor(ev *events.State) error {
 		var (
 			APosition = actor.Position() // relative to screen
 			APoint    = actor.Drawing.Position()
-			ASize     = actor.Canvas.Size()
+			ASize     = actor.Drawing.Size()
 			scrollBy  render.Point
 		)