Sure, here's an example of a simple cycle stunt game using HTML and JavaScript, designed for smartphone operation:
In this game, you control a blue bike and your goal is to perform stunts (wheelie/stoopie) by tapping or clicking on the screen. The bike will move upwards, and the score will increase as long as you stay in bounds. The game ends when the bike goes off-screen. You can customize the game graphics, controls, and stunt logic as needed. Have fun playing!