diff --git a/cmd/tools/vtest-cleancode.v b/cmd/tools/vtest-cleancode.v
index 520b1b5d59..71d7fbfaf3 100644
--- a/cmd/tools/vtest-cleancode.v
+++ b/cmd/tools/vtest-cleancode.v
@@ -11,6 +11,9 @@ const (
 		'vlib/v',
 		'cmd/v',
 		'cmd/tools',
+		'examples/2048',
+		'examples/tetris',
+		'examples/term.ui',
 	]
 	verify_known_failing_exceptions = []string{}
 	vfmt_verify_list                = [
diff --git a/examples/2048/2048.v b/examples/2048/2048.v
index 16b5718839..5643f8845d 100644
--- a/examples/2048/2048.v
+++ b/examples/2048/2048.v
@@ -66,7 +66,7 @@ const (
 				gx.rgb(237, 204, 97), /* 256 */
 				gx.rgb(237, 200, 80), /* 512 */
 				gx.rgb(237, 197, 63), /* 1024 */
-				gx.rgb(237, 194, 46), /* 2048 */
+				gx.rgb(237, 194, 46),
 			]
 		},
 		&Theme{
diff --git a/examples/term.ui/cursor_chaser.v b/examples/term.ui/cursor_chaser.v
index c8e4545258..dd987e6dba 100644
--- a/examples/term.ui/cursor_chaser.v
+++ b/examples/term.ui/cursor_chaser.v
@@ -88,11 +88,13 @@ fn event(e &tui.Event, x voidptr) {
 	}
 }
 
-mut app := &App{}
-app.tui = tui.init(
-	user_data: app
-	frame_fn: frame
-	event_fn: event
-	hide_cursor: true
-)
-app.tui.run() ?
+fn main() {
+	mut app := &App{}
+	app.tui = tui.init(
+		user_data: app
+		frame_fn: frame
+		event_fn: event
+		hide_cursor: true
+	)
+	app.tui.run() ?
+}
diff --git a/examples/term.ui/event_viewer.v b/examples/term.ui/event_viewer.v
index 50dd0bd683..585faabd8f 100644
--- a/examples/term.ui/event_viewer.v
+++ b/examples/term.ui/event_viewer.v
@@ -31,15 +31,17 @@ fn event(e &tui.Event, x voidptr) {
 	}
 }
 
-mut app := &App{}
-app.tui = tui.init(
-	user_data: app
-	event_fn: event
-	window_title: 'V term.ui event viewer'
-	hide_cursor: true
-	capture_events: true
-	frame_rate: 60
-	use_alternate_buffer: false
-)
-println('V term.ui event viewer (press `esc` to exit)\n\n')
-app.tui.run() ?
+fn main() {
+	mut app := &App{}
+	app.tui = tui.init(
+		user_data: app
+		event_fn: event
+		window_title: 'V term.ui event viewer'
+		hide_cursor: true
+		capture_events: true
+		frame_rate: 60
+		use_alternate_buffer: false
+	)
+	println('V term.ui event viewer (press `esc` to exit)\n\n')
+	app.tui.run() ?
+}
diff --git a/examples/term.ui/pong.v b/examples/term.ui/pong.v
index 925b9d4fb7..170ac2d1e5 100644
--- a/examples/term.ui/pong.v
+++ b/examples/term.ui/pong.v
@@ -480,17 +480,18 @@ fn event(e &ui.Event, x voidptr) {
 	app.event(e)
 }
 
-// main
-mut app := &App{}
-app.tui = ui.init(
-	user_data: app
-	init_fn: init
-	frame_fn: frame
-	cleanup_fn: cleanup
-	event_fn: event
-	fail_fn: fail
-	capture_events: true
-	hide_cursor: true
-	frame_rate: 60
-)
-app.tui.run() ?
+fn main() {
+	mut app := &App{}
+	app.tui = ui.init(
+		user_data: app
+		init_fn: init
+		frame_fn: frame
+		cleanup_fn: cleanup
+		event_fn: event
+		fail_fn: fail
+		capture_events: true
+		hide_cursor: true
+		frame_rate: 60
+	)
+	app.tui.run() ?
+}
diff --git a/examples/term.ui/rectangles.v b/examples/term.ui/rectangles.v
index d316fee672..9feb9649a9 100644
--- a/examples/term.ui/rectangles.v
+++ b/examples/term.ui/rectangles.v
@@ -84,12 +84,14 @@ fn frame(x voidptr) {
 	app.redraw = false
 }
 
-mut app := &App{}
-app.tui = tui.init(
-	user_data: app
-	event_fn: event
-	frame_fn: frame
-	hide_cursor: true
-	frame_rate: 60
-)
-app.tui.run() ?
+fn main() {
+	mut app := &App{}
+	app.tui = tui.init(
+		user_data: app
+		event_fn: event
+		frame_fn: frame
+		hide_cursor: true
+		frame_rate: 60
+	)
+	app.tui.run() ?
+}
diff --git a/examples/term.ui/vyper.v b/examples/term.ui/vyper.v
index 34966f7945..d392dd81a8 100644
--- a/examples/term.ui/vyper.v
+++ b/examples/term.ui/vyper.v
@@ -460,13 +460,15 @@ fn (mut a App) draw_gameover() {
 	a.termui.draw_text(start_x, (a.height / 2) + 3 * block_size, '   #####  #    # #    # ######   #######   ##   ###### #    #  ')
 }
 
-mut app := &App{}
-app.termui = termui.init(
-	user_data: app
-	event_fn: event
-	frame_fn: frame
-	init_fn: init
-	hide_cursor: true
-	frame_rate: 10
-)
-app.termui.run() ?
+fn main() {
+	mut app := &App{}
+	app.termui = termui.init(
+		user_data: app
+		event_fn: event
+		frame_fn: frame
+		init_fn: init
+		hide_cursor: true
+		frame_rate: 10
+	)
+	app.termui.run() ?
+}
diff --git a/examples/tetris/tetris.v b/examples/tetris/tetris.v
index befa21d663..dda5926baa 100644
--- a/examples/tetris/tetris.v
+++ b/examples/tetris/tetris.v
@@ -61,7 +61,7 @@ const (
 		gx.rgb(255, 180, 31), /* orange long topleft */
 		gx.rgb(33, 66, 255), /* blue long topright */
 		gx.rgb(74, 198, 255), /* lightblue longest */
-		gx.rgb(0, 170, 170), /* unused ? */
+		gx.rgb(0, 170, 170),
 	]
 	background_color = gx.white
 	ui_color         = gx.rgba(255, 0, 0, 210)