diff --git a/go.mod b/go.mod
index 3064264..7ece437 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,17 @@
 module git.saintnet.tech/freego
 
 go 1.17
+
+require (
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20211213063430-748e38ca8aec // indirect
+	github.com/hajimehoshi/ebiten v1.12.12 // indirect
+	github.com/hajimehoshi/ebiten/v2 v2.2.5 // indirect
+	github.com/jezek/xgb v1.0.0 // indirect
+	golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 // indirect
+	golang.org/x/exp/shiny v0.0.0-20220218215828-6cf2b201936e // indirect
+	golang.org/x/image v0.0.0-20211028202545-6944b10bf410 // indirect
+	golang.org/x/mobile v0.0.0-20220112015953-858099ff7816 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sys v0.0.0-20220209214540-3681064d5158 // indirect
+	golang.org/x/text v0.3.6 // indirect
+)
diff --git a/input.go b/input.go
new file mode 100644
index 0000000..a089449
--- /dev/null
+++ b/input.go
@@ -0,0 +1,206 @@
+package main
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+// Dir represents a direction.
+type Dir int
+
+// represents the valid directions
+const (
+	DirUp Dir = iota
+	DirRight
+	DirDown
+	DirLeft
+)
+
+type mouseState int
+
+const (
+	mouseStateNone mouseState = iota
+	mouseStatePressing
+	mouseStateSettled
+)
+
+type touchState int
+
+const (
+	touchStateNone touchState = iota
+	touchStatePressing
+	touchStateSettled
+	touchStateInvalid
+)
+
+// String returns a string representing the direction.
+func (d Dir) String() string {
+	switch d {
+	case DirUp:
+		return "Up"
+	case DirRight:
+		return "Right"
+	case DirDown:
+		return "Down"
+	case DirLeft:
+		return "Left"
+	}
+	panic("not reach")
+}
+
+// Vector returns a [-1, 1] value for each axis.
+func (d Dir) Vector() (x, y int) {
+	switch d {
+	case DirUp:
+		return 0, -1
+	case DirRight:
+		return 1, 0
+	case DirDown:
+		return 0, 1
+	case DirLeft:
+		return -1, 0
+	}
+	panic("not reach")
+}
+
+// Input represents the current key states.
+type Input struct {
+	mouseState    mouseState
+	mouseInitPosX int
+	mouseInitPosY int
+	mouseDir      Dir
+
+	touches       []ebiten.TouchID
+	touchState    touchState
+	touchID       ebiten.TouchID
+	touchInitPosX int
+	touchInitPosY int
+	touchLastPosX int
+	touchLastPosY int
+	touchDir      Dir
+}
+
+// NewInput generates a new Input object.
+func NewInput() *Input {
+	return &Input{}
+}
+
+func abs(x int) int {
+	if x < 0 {
+		return -x
+	}
+	return x
+}
+
+func vecToDir(dx, dy int) (Dir, bool) {
+	if abs(dx) < 4 && abs(dy) < 4 {
+		return 0, false
+	}
+	if abs(dx) < abs(dy) {
+		if dy < 0 {
+			return DirUp, true
+		}
+		return DirDown, true
+	}
+	if dx < 0 {
+		return DirLeft, true
+	}
+	return DirRight, true
+}
+
+// Update updates the current input states.
+func (i *Input) Update() {
+	switch i.mouseState {
+	case mouseStateNone:
+		if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
+			x, y := ebiten.CursorPosition()
+			i.mouseInitPosX = x
+			i.mouseInitPosY = y
+			i.mouseState = mouseStatePressing
+		}
+	case mouseStatePressing:
+		if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
+			x, y := ebiten.CursorPosition()
+			dx := x - i.mouseInitPosX
+			dy := y - i.mouseInitPosY
+			d, ok := vecToDir(dx, dy)
+			if !ok {
+				i.mouseState = mouseStateNone
+				break
+			}
+			i.mouseDir = d
+			i.mouseState = mouseStateSettled
+		}
+	case mouseStateSettled:
+		i.mouseState = mouseStateNone
+	}
+
+	i.touches = ebiten.AppendTouchIDs(i.touches[:0])
+	switch i.touchState {
+	case touchStateNone:
+		if len(i.touches) == 1 {
+			i.touchID = i.touches[0]
+			x, y := ebiten.TouchPosition(i.touches[0])
+			i.touchInitPosX = x
+			i.touchInitPosY = y
+			i.touchLastPosX = x
+			i.touchLastPosX = y
+			i.touchState = touchStatePressing
+		}
+	case touchStatePressing:
+		if len(i.touches) >= 2 {
+			break
+		}
+		if len(i.touches) == 1 {
+			if i.touches[0] != i.touchID {
+				i.touchState = touchStateInvalid
+			} else {
+				x, y := ebiten.TouchPosition(i.touches[0])
+				i.touchLastPosX = x
+				i.touchLastPosY = y
+			}
+			break
+		}
+		if len(i.touches) == 0 {
+			dx := i.touchLastPosX - i.touchInitPosX
+			dy := i.touchLastPosY - i.touchInitPosY
+			d, ok := vecToDir(dx, dy)
+			if !ok {
+				i.touchState = touchStateNone
+				break
+			}
+			i.touchDir = d
+			i.touchState = touchStateSettled
+		}
+	case touchStateSettled:
+		i.touchState = touchStateNone
+	case touchStateInvalid:
+		if len(i.touches) == 0 {
+			i.touchState = touchStateNone
+		}
+	}
+}
+
+// Dir returns a currently pressed direction.
+// Dir returns false if no direction key is pressed.
+func (i *Input) Dir() (Dir, bool) {
+	if inpututil.IsKeyJustPressed(ebiten.KeyArrowUp) {
+		return DirUp, true
+	}
+	if inpututil.IsKeyJustPressed(ebiten.KeyArrowLeft) {
+		return DirLeft, true
+	}
+	if inpututil.IsKeyJustPressed(ebiten.KeyArrowRight) {
+		return DirRight, true
+	}
+	if inpututil.IsKeyJustPressed(ebiten.KeyArrowDown) {
+		return DirDown, true
+	}
+	if i.mouseState == mouseStateSettled {
+		return i.mouseDir, true
+	}
+	if i.touchState == touchStateSettled {
+		return i.touchDir, true
+	}
+	return 0, false
+}
diff --git a/main.go b/main.go
index abbe74f..374ccb2 100644
--- a/main.go
+++ b/main.go
@@ -1,16 +1,128 @@
 package main
 
-import "fmt"
+import (
+	"errors"
+	"fmt"
+	"log"
+	"time"
 
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+func dummyGame() (*Game, error) {
+	g := &Game{
+		board: NewBoard(4),
+		state: gameSetup,
+	}
+	//Setup terrain
+	terrain := []struct {
+		x, y, t int
+	}{
+		{1, 1, 1},
+		{2, 2, 1},
+	}
+	for _, tt := range terrain {
+		res, err := g.board.AddTerrain(tt.x, tt.y, tt.t)
+		if err != nil {
+			return nil, err
+		}
+		if !res {
+			return nil, errors.New("Error creating terrain")
+		}
+	}
+	pieces := []struct {
+		x, y int
+		p    *Piece
+	}{
+		{0, 0, NewPiece(Flag, Blue)},
+		{3, 0, NewPiece(Spy, Blue)},
+		{2, 0, NewPiece(Captain, Blue)},
+		{3, 1, NewPiece(Marshal, Blue)},
+		{0, 1, NewPiece(Bomb, Blue)},
+
+		{1, 2, NewPiece(Flag, Red)},
+		{3, 2, NewPiece(Spy, Red)},
+		{2, 3, NewPiece(Captain, Red)},
+		{0, 2, NewPiece(Marshal, Red)},
+		{0, 3, NewPiece(Bomb, Red)},
+	}
+	for _, tt := range pieces {
+		res, err := g.SetupPiece(tt.x, tt.y, tt.p)
+		if err != nil {
+			return nil, fmt.Errorf("Piece %v,%v:%v", tt.x, tt.y, err)
+		}
+		if !res {
+			return nil, errors.New("error placing dummy piece")
+		}
+	}
+	_, err := g.SetupPiece(0, 0, NewPiece(Flag, Blue))
+	if err != nil {
+		return nil, err
+	}
+
+	return g, nil
+}
 func main() {
 	//red := NewDummyPlayer(Red)
 	//blue := NewDummyPlayer(Blue)
-	g := NewGame()
-	g.state = gameSetup
-	printboardcolours(g)
+	g, err := dummyGame()
+	if err != nil {
+		panic(err)
+	}
+	go func(g *Game) {
+		r := NewDummyPlayer(Red)
+		b := NewDummyPlayer(Blue)
+		g.Start()
+		var moves = []struct {
+			input  string
+			player Player
+			res    bool
+		}{
+			{"c3-b3", r, true},
+			{"c0-c1", b, true},
+			{"d2xd1", r, true},
+			{"c1-d1", b, true},
+			{"b3-c3", r, true},
+			{"d1xd2", b, true},
+		}
+		for i, tt := range moves {
+			time.Sleep(3 * time.Second)
+			log.Printf("playing move %v\n", i)
+			raw, err := NewRawCommand(tt.input)
+			if err != nil {
+				panic(err)
+			}
+			parsed, err := g.Parse(tt.player, raw)
+			if err != nil {
+				panic(err)
+			}
+			res, err := g.Mutate(parsed)
+			if err != nil {
+				panic(err)
+			}
+			if res {
+				log.Printf("move %v successful\n", i)
+			}
+
+		}
+
+	}(g)
+	viewer(g)
 	return
 }
 
+func viewer(g *Game) {
+	v, err := NewViewer(g)
+	if err != nil {
+		panic(err)
+	}
+	ebiten.SetWindowSize(800, 640)
+	ebiten.SetWindowTitle("Freego")
+	if err := ebiten.RunGame(v); err != nil {
+		panic(err)
+	}
+}
+
 func addpiece(game *Game, rank int, c Colour, x int, y int) {
 	res, err := game.SetupPiece(x, y, NewPieceFromInt(rank, c))
 	if err != nil {
diff --git a/view_board.go b/view_board.go
new file mode 100644
index 0000000..9798c95
--- /dev/null
+++ b/view_board.go
@@ -0,0 +1,91 @@
+package main
+
+import (
+	"errors"
+	"image/color"
+	"log"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+var errorTaskTerminated = errors.New("freego: task terminated")
+
+type task func() error
+
+// ViewBoard represents the game board.
+type ViewBoard struct {
+	size  int
+	tiles map[*ViewTile]struct{}
+	tasks []task
+}
+
+// NewViewBoard generates a new ViewBoard with giving a size.
+func NewViewBoard(g *Game) (*ViewBoard, error) {
+	size := g.board.size
+	b := &ViewBoard{
+		size:  size,
+		tiles: map[*ViewTile]struct{}{},
+	}
+	for i := 0; i < size; i++ {
+		for j := 0; j < size; j++ {
+			b.tiles[NewViewTile(i, j, g.board.board[i][j])] = struct{}{}
+		}
+	}
+
+	return b, nil
+}
+
+//func (b *ViewBoard) tileAt(x, y int) *Tile {
+//	return tileAt(b.tiles, x, y)
+//}
+
+// Update updates the board state.
+func (b *ViewBoard) Update(input *Input) error {
+	for t := range b.tiles {
+		if err := t.Update(); err != nil {
+			return err
+		}
+	}
+	if 0 < len(b.tasks) {
+		t := b.tasks[0]
+		if err := t(); err == errorTaskTerminated {
+			b.tasks = b.tasks[1:]
+		} else if err != nil {
+			return err
+		}
+		return nil
+	}
+	if dir, ok := input.Dir(); ok {
+		//if err := b.Move(dir); err != nil {
+		//	return err
+		//}
+		log.Println(dir)
+	}
+	return nil
+}
+
+// Draw draws the board to the given boardImage.
+func (b *ViewBoard) Draw(boardImage *ebiten.Image) {
+	boardImage.Fill(color.RGBA{0xbb, 0xad, 0xa0, 0xff})
+	for j := 0; j < b.size; j++ {
+		for i := 0; i < b.size; i++ {
+			//v := 0
+			op := &ebiten.DrawImageOptions{}
+			x := i*tileSize + (i+1)*tileMargin
+			y := j*tileSize + (j+1)*tileMargin
+			op.GeoM.Translate(float64(x), float64(y))
+			//op.ColorM.ScaleWithColor(tileBackgroundColor(v))
+			boardImage.DrawImage(tileImage, op)
+		}
+	}
+	for t := range b.tiles {
+		t.Draw(boardImage)
+	}
+}
+
+// Size returns the board size.
+func (b *ViewBoard) Size() (int, int) {
+	x := b.size*tileSize + (b.size+1)*tileMargin
+	y := x
+	return x, y
+}
diff --git a/view_tile.go b/view_tile.go
new file mode 100644
index 0000000..aed8fb9
--- /dev/null
+++ b/view_tile.go
@@ -0,0 +1,129 @@
+package main
+
+import (
+	"image/color"
+	"log"
+
+	"github.com/hajimehoshi/ebiten/examples/resources/fonts"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/text"
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/opentype"
+)
+
+//ViewTile is a tile in the viewer
+type ViewTile struct {
+	gameTile *Tile
+
+	// next represents a next tile information after moving.
+	// next is empty when the tile is not about to move.
+	//next TileData
+
+	//movingCount       int
+	//startPoppingCount int
+	//poppingCount      int
+}
+
+var (
+	tileImage = ebiten.NewImage(tileSize, tileSize)
+)
+
+var (
+	mplusSmallFont  font.Face
+	mplusNormalFont font.Face
+	mplusBigFont    font.Face
+)
+
+const (
+	tileSize   = 80
+	tileMargin = 4
+)
+
+func init() {
+	tt, err := opentype.Parse(fonts.MPlus1pRegular_ttf)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	const dpi = 72
+	mplusSmallFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
+		Size:    24,
+		DPI:     dpi,
+		Hinting: font.HintingFull,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	mplusNormalFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
+		Size:    32,
+		DPI:     dpi,
+		Hinting: font.HintingFull,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	mplusBigFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
+		Size:    48,
+		DPI:     dpi,
+		Hinting: font.HintingFull,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+//NewViewTile creates a new view tile
+func NewViewTile(x, y int, t *Tile) *ViewTile {
+	return &ViewTile{
+		gameTile: t,
+	}
+}
+
+// Update updates the tile's animation states.
+func (t *ViewTile) Update() error {
+	return nil
+}
+
+// Draw draws the current tile to the given boardImage.
+func (t *ViewTile) Draw(boardImage *ebiten.Image) {
+	j, i := t.gameTile.x, t.gameTile.y
+	v := t.gameTile.entity
+	if v == nil && t.gameTile.Passable() {
+		return
+	}
+	op := &ebiten.DrawImageOptions{}
+	x := i*tileSize + (i+1)*tileMargin
+	y := j*tileSize + (j+1)*tileMargin
+	op.GeoM.Translate(float64(x), float64(y))
+	//op.ColorM.ScaleWithColor(tileBackgroundColor(v))
+	boardImage.DrawImage(tileImage, op)
+	str := "NA"
+	if v == nil {
+		str = "river"
+	} else {
+		str = v.Rank.String()
+	}
+
+	f := mplusBigFont
+	switch {
+	case 3 < len(str):
+		f = mplusSmallFont
+	case 2 < len(str):
+		f = mplusNormalFont
+	}
+
+	bound, _ := font.BoundString(f, str)
+	w := (bound.Max.X - bound.Min.X).Ceil()
+	h := (bound.Max.Y - bound.Min.Y).Ceil()
+	x = x + (tileSize-w)/2
+	y = y + (tileSize-h)/2 + h
+	pieceColor := color.RGBA{0xf9, 0xf6, 0xf2, 0xff}
+	if v != nil {
+		if t.gameTile.entity.Owner == Red {
+			pieceColor = color.RGBA{0xff, 0x0, 0x0, 0xff}
+		} else if t.gameTile.entity.Owner == Blue {
+			pieceColor = color.RGBA{0x0, 0x0, 0xff, 0xff}
+		}
+	}
+	text.Draw(boardImage, str, f, x, y, pieceColor)
+}
diff --git a/viewer.go b/viewer.go
new file mode 100644
index 0000000..df6c3ee
--- /dev/null
+++ b/viewer.go
@@ -0,0 +1,60 @@
+package main
+
+import (
+	"image/color"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+//Viewer is a graphical representation of a freego game
+type Viewer struct {
+	input      *Input
+	board      *ViewBoard
+	boardImage *ebiten.Image
+	gameState  *Game
+}
+
+//NewViewer creates a new viewer
+func NewViewer(g *Game) (*Viewer, error) {
+	v := &Viewer{
+		input:     NewInput(),
+		gameState: g,
+	}
+	var err error
+	v.board, err = NewViewBoard(g)
+	if err != nil {
+		panic(err)
+	}
+	return v, nil
+}
+
+// Layout implements ebiten.Game's Layout.
+func (v *Viewer) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
+	return 800, 640
+}
+
+// Update updates the current game state.
+func (v *Viewer) Update() error {
+	v.input.Update()
+	if err := v.board.Update(v.input); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Draw draws the current game to the given screen.
+func (v *Viewer) Draw(screen *ebiten.Image) {
+	if v.boardImage == nil {
+		w, h := v.board.Size()
+		v.boardImage = ebiten.NewImage(w, h)
+	}
+	screen.Fill(color.RGBA{0xfa, 0xf8, 0xef, 0xff})
+	v.board.Draw(v.boardImage)
+	op := &ebiten.DrawImageOptions{}
+	sw, sh := screen.Size()
+	bw, bh := v.boardImage.Size()
+	x := (sw - bw) / 2
+	y := (sh - bh) / 2
+	op.GeoM.Translate(float64(x), float64(y))
+	screen.DrawImage(v.boardImage, op)
+}