OCO is a free puzzle-platformer game available on Android developed by SPECTRUM48. It is an exceptional one-touch game that has received high praise from both Pocket Gamer and Touch Arcade. The game features 135 hand-crafted puzzles that players can solve using simple one-touch controls. The game also has a built-in editor that allows players to create and share their own designs with their friends. Moreover, the game has an online community where players can explore hundreds of user-generated levels. The game's minimalistic design and procedurally-generated soundtrack add to its overall appeal.

OCO offers challenging puzzles that require precision platforming skills. The game has received several awards, including the Runner-up 'Big Indie Pitch' award at Develop, Brighton, in 2018 and the Finalist 'Very Big Indie Pitch' award at Pocket Gamer Connects, London, in 2017.

Overall, OCO is an addictive and intelligent one-touch puzzle-platformer game that offers a unique gaming experience.