diff --git a/Makefile b/Makefile
index b20eada..9511555 100644
--- a/Makefile
+++ b/Makefile
@@ -85,3 +85,12 @@ show-versions: buildlocal
 
 # lint:
 # 	golangci-lint run -p bugs -p unused
+
+buildwasm:
+	env GOOS=js GOARCH=wasm go build -o $(tool).wasm $(LDFLAGS) .
+
+zipwasm:
+	zip -r openquell-$(SHORTVERSION).zip index.html $(tool).wasm wasm_exec.js
+
+wasm: buildwasm zipwasm
+	@ls -l $(tool)-$(SHORTVERSION).zip
diff --git a/game.go b/game.go
index 105d195..25c7b28 100644
--- a/game.go
+++ b/game.go
@@ -116,6 +116,12 @@ func (game *Game) UpdateCells() {
 	game.TicksElapsed = 0
 }
 
+func (game *Game) Reset() {
+	game.Paused = true
+	game.InitGrid(nil)
+	game.Paused = false
+}
+
 // check user input
 func (game *Game) CheckInput() {
 	if inpututil.IsKeyJustPressed(ebiten.KeyQ) {
@@ -152,6 +158,10 @@ func (game *Game) CheckInput() {
 		game.SaveState()
 	}
 
+	if inpututil.IsKeyJustPressed(ebiten.KeyR) {
+		game.Reset()
+	}
+
 	if game.Paused {
 		if inpututil.IsKeyJustPressed(ebiten.KeyN) {
 			game.RunOneStep = true
@@ -349,6 +359,31 @@ func (game *Game) InitPattern() {
 }
 
 // initialize playing field/grid
+func (game *Game) _InitGrid(grid *Grid) {
+	if grid != nil {
+		// use pre-loaded grid
+		game.Grids = []*Grid{
+			grid,
+			NewGrid(grid.Width, grid.Height),
+		}
+
+		game.History = NewGrid(grid.Width, grid.Height)
+
+		return
+	}
+
+	grida := NewGrid(game.Width, game.Height)
+
+	grida.FillRandom(game)
+
+	game.Grids = []*Grid{
+		grida,
+		NewGrid(grida.Width, grida.Height),
+	}
+
+	game.History = grida.Clone()
+}
+
 func (game *Game) InitGrid(grid *Grid) {
 	if grid != nil {
 		// use pre-loaded grid
diff --git a/go.mod b/go.mod
index 246e0d8..d93f07f 100644
--- a/go.mod
+++ b/go.mod
@@ -9,6 +9,7 @@ require (
 )
 
 require (
+	github.com/alecthomas/repr v0.4.0 // indirect
 	github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895 // indirect
 	github.com/ebitengine/hideconsole v1.0.0 // indirect
 	github.com/ebitengine/purego v0.7.0 // indirect
diff --git a/go.sum b/go.sum
index 3b0eded..0fa22ed 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
+github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
+github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895 h1:48bCqKTuD7Z0UovDfvpCn7wZ0GUZ+yosIteNDthn3FU=
 github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895/go.mod h1:XZdLv05c5hOZm3fM2NlJ92FyEZjnslcMcNRrhxs8+8M=
 github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj1yReDqE=
diff --git a/grid.go b/grid.go
index e1c7797..5694653 100644
--- a/grid.go
+++ b/grid.go
@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
+	"math/rand"
 	"os"
 	"strconv"
 	"strings"
@@ -40,6 +41,26 @@ func (grid *Grid) Clone() *Grid {
 	return newgrid
 }
 
+func (grid *Grid) Clear() {
+	for y := range grid.Data {
+		for x := range grid.Data[y] {
+			grid.Data[y][x] = 0
+		}
+	}
+}
+
+func (grid *Grid) FillRandom(game *Game) {
+	if !game.Empty {
+		for y := range grid.Data {
+			for x := range grid.Data[y] {
+				if rand.Intn(game.Density) == 1 {
+					grid.Data[y][x] = 1
+				}
+			}
+		}
+	}
+}
+
 func GetFilename(generations int64) string {
 	now := time.Now()
 	return fmt.Sprintf("dump-%s-%d.gol", now.Format("20060102150405"), generations)