About Cube IO
Cube IO is a free territory capture io game in 3D. Your cube starts on a small patch of colour and keeps moving. Leave your land and it draws a trail behind it; come back home and everything inside the loop becomes yours. Rival cubes do the same all around you, each with its own home and its own way of grabbing land.
The danger is the trail. Touch a trail while you are out in the open and you are cut off; lure rivals across trails to knock them out, and be the last cube standing to win the level. Every level is different: it starts with three rivals and adds one every two levels up to eight, rivals get quicker, every fifth level brings a giant crowned boss cube, and from level three gems lie around the arena for extra coins. The world around the arena changes every two levels, from meadow and beach to city, farm, desert, sunset, snow and a starry night.
Every win pays coins, shared across TinyJar Games. Spend them on eight shapes for your cube, from the classic cube to a gem, star, heart, crown, gift, trophy and shield, each with its own land colour, and on upgrades: Start Size for a bigger home patch, Speed for a quicker cube and Coin Bonus for bigger rewards. Cube IO runs on phones, tablets and computers with no download.
Cube IO at a glance
- Genre
- Arcade
- Plays on
- Phone, tablet and computer, in any modern browser
- Screen
- Portrait (made for phones; fits any screen)
- Download
- 11 MB, no install
- Progress
- Saved in your browser; coins are shared by every TinyJar game
- Price
- Free (optional one-time Remove Ads)
- Updated
- 28 October 2026
How to play Cube IO
- Press Start to drop into the arena.
- Drag in the direction you want your cube to go; it keeps moving on its own.
- Leave your land and loop back to claim the area you circled.
- Avoid touching trails while you are outside your land, and knock out every rival to win.
Controls
- Computer
- Hold the left mouse button and drag to steer, or use the arrow keys.
- Phone and tablet
- Touch and drag to steer.
Tips
- Small, quick loops are safer than big ones: the longer your trail, the easier it is to get cut off.
- Head home as soon as a rival turns towards your trail.
- Start Size gives you room to turn safely at the start of a round.
- From level 3, gems are worth 5 coins each: pick them up on short loops near your land.
- Boss cubes are big and fast, but a trail knocks them out like any other rival.
Frequently asked questions
Is Cube IO free?
Yes. Cube IO is free to play in your browser on TinyJar Games, with no download or sign-up.
Is Cube IO multiplayer?
No. The rival cubes are computer players, so you can play any time without waiting for a match.
How do I win a round?
Knock out every rival cube: make them run into a trail. Levels start with three rivals and add one every two levels up to eight, and every fifth level has a boss cube.
What happens if I get cut off?
Once per round you can respawn in the middle of your land with a short moment of protection, or start the round again.
What can I buy with coins?
Eight cube shapes (Cube, Mint Gem, Star, Heart, Crown, Gift, Trophy and Shield), each with its own colour, and three upgrades: Start Size, Speed and Coin Bonus.
Does it work on phones?
Yes. It runs in the browser on Android phones, iPhones, tablets and computers.