Walls is an arcade game developed by NiJo Games for Android devices. The game is free to play and falls under the subcategory of arcade games. In Walls, the player has to launch a ball and make it out of the box without hitting the red part. The game consists of 50 unique levels that get increasingly challenging as the player progresses.

The objective of the game is to bounce the ball against walls the required number of times to open the red part and escape the box. However, if the ball bounces against walls more than the required number of times, the player loses. Walls also has a classic mode, where the number of required bounces increases by one after every score.

Walls is an incredibly challenging game that will test the player's skills and reflexes. The game also features a leaderboard, where players can compete against each other. Overall, Walls is a fun and addictive arcade game that is definitely worth a try.