Mononinja

One tap too long and your ninja is a smear on the floor - that's the tension Mononinja runs on. You hold the jump button, the height builds, and you have to let go at exactly the right instant or the next obstacle ends your run cold.

Thirty-plus levels stand between you and calling yourself a shinobi, each one a fresh arrangement of ways to die. There's no combat here, no enemies to fight, just precise jumps and the creeping dread of knowing one twitchy tap will send you back to the start.

It plays right in the browser on desktop, no download needed, and stays clean enough for anyone to pick up - no blood, just clever obstacle placement. If you like games built entirely around timing and nerve, Kick Lucky Blocks Online and Dragon Hunter scratch a similar itch.

Mononinja rewards patience more than speed. Rush it and you'll faceplant into level 4 for the tenth time. Slow down, learn the hold, and those thirty levels start feeling less like a wall and more like a checklist.

Guide the ninja past every obstacle to reach the end of each of the 30+ levels without dying. Precision, not speed, gets you through.

On desktop, press and hold the SPACE key to jump - the longer you hold it, the higher you go. On mobile, tap and hold the screen to do the same thing.

Don't hold the jump for a full second out of habit. Match the hold time to the gap or obstacle in front of you, or you'll overshoot straight into trouble.