diff --git a/README.md b/README.md
index fdfdb6c..84b5a3f 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,9 @@ John Conway himself: https://youtu.be/R9Plq-D1gEk?si=yYxs77e9yXxeSNbL
 
 Based on: https://youtu.be/FWSR_7kZuYg?si=ix1dmo76D8AmF25F
 
+https://youtu.be/xEto6Oew16I
+[![game preview](https://img.youtube.com/vi/xEto6Oew16I/0.jpg)](https://www.youtube.com/watch?v=xEto6Oew16I)
+
 # Features
 
 * flexible parameters as grid and cell size
diff --git a/src/config.go b/src/config.go
index ce2db9c..5b479b6 100644
--- a/src/config.go
+++ b/src/config.go
@@ -223,21 +223,20 @@ func ParseCommandline() (*Config, error) {
 	pflag.StringVarP(&rlefile, "pattern-file", "f", "", "RLE or LIF pattern file")
 
 	pflag.BoolVarP(&config.ShowVersion, "version", "v", false, "show version")
+	pflag.BoolVarP(&config.ShowGrid, "show-grid", "g", false, "draw grid lines")
+	pflag.BoolVarP(&config.ShowEvolution, "show-evolution", "s", false, "show evolution traces")
+
 	pflag.BoolVarP(&config.Paused, "paused", "p", false, "do not start simulation (use space to start)")
 	pflag.BoolVarP(&config.Debug, "debug", "d", false, "show debug info")
-	pflag.BoolVarP(&config.ShowGrid, "show-grid", "g", false, "draw grid lines")
 	pflag.BoolVarP(&config.Empty, "empty", "e", false, "start with an empty screen")
 
 	// style
 	pflag.StringVarP(&config.Theme, "theme", "T", DEFAULT_THEME, "color theme: standard, dark, light (default: standard)")
 
-	pflag.BoolVarP(&config.ShowEvolution, "show-evolution", "s", false, "show evolution traces")
 	pflag.BoolVarP(&config.Wrap, "wrap-around", "w", false, "wrap around grid mode")
 	pflag.BoolVarP(&config.UseShader, "use-shader", "k", false, "use shader for cell rendering")
 
 	pflag.StringVarP(&config.ProfileFile, "profile-file", "", "", "enable profiling")
-	pflag.BoolVarP(&config.ProfileDraw, "profile-draw", "", false, "profile draw method (default false)")
-	pflag.Int64VarP(&config.ProfileMaxLoops, "profile-max-loops", "", 10, "how many loops to execute (default 10)")
 
 	pflag.Parse()
 
@@ -278,8 +277,10 @@ func (config *Config) SwitchTheme(theme string) {
 }
 
 func (config *Config) ToggleGridlines() {
+	fmt.Printf("toggle grid lines, current: %t\n", config.ShowGrid)
 	config.ShowGrid = !config.ShowGrid
 	config.RestartCache = true
+	fmt.Printf("toggle grid lines, new: %t\n", config.ShowGrid)
 }
 
 func (config *Config) ToggleEvolution() {
diff --git a/src/options.go b/src/options.go
index cb9cc27..633cfa7 100644
--- a/src/options.go
+++ b/src/options.go
@@ -1,8 +1,10 @@
 package main
 
 import (
+	"fmt"
 	"image/color"
 
+	"github.com/alecthomas/repr"
 	"github.com/ebitenui/ebitenui"
 	"github.com/ebitenui/ebitenui/widget"
 	"github.com/hajimehoshi/ebiten/v2"
@@ -69,14 +71,11 @@ func (scene *SceneOptions) Draw(screen *ebiten.Image) {
 }
 
 func (scene *SceneOptions) SetInitialValue(w *widget.LabeledCheckbox, value bool) {
-	var intval int
 	if value {
-		intval = 1
+		w.SetState(
+			widget.WidgetChecked,
+		)
 	}
-
-	w.SetState(
-		widget.WidgetState(intval),
-	)
 }
 
 func (scene *SceneOptions) Init() {
@@ -95,6 +94,8 @@ func (scene *SceneOptions) Init() {
 
 	gridlines := NewCheckbox("Show grid lines",
 		func(args *widget.CheckboxChangedEventArgs) {
+			fmt.Println("CHECKBOX CALLED")
+			repr.Println(args.State)
 			scene.Config.ToggleGridlines()
 		})
 	scene.SetInitialValue(gridlines, scene.Config.ShowGrid)
diff --git a/src/play.go b/src/play.go
index 8717a0f..82d6257 100644
--- a/src/play.go
+++ b/src/play.go
@@ -184,6 +184,7 @@ func (scene *ScenePlay) CheckInput() {
 
 	if inpututil.IsKeyJustPressed(ebiten.KeyC) {
 		scene.Config.Markmode = true
+		scene.Config.Drawmode = false
 		scene.Config.Paused = true
 	}