Focus is a fast-paced action platformer set in different non-scrolling rooms. Players control a small, white creature that is only able to move around and jump. To escape, the exit to the next room has to be unlocked. This is done by pressing a number of yellow buttons. Early on walking over them is sufficient for activation, but in later levels the player needs to lure opponents, shooting rockets, to target the yellow areas in order to trigger them.

Every rocket blast is deadly, but hitting the floor also launches debris that is just as fatal. After a few levels players get access to the Focus Mode. When pressing a button everything slows down significantly, similar to bullet time, but at the edge of the circle surrounding the creature an arrow appear to teleport to that area. There is only a limited amount of focus energy in every area and it can also be used to transport through lasers or walls for instance. Other difficulties include spikes, explosive blocks and moving platforms. After a while the basic focus mode is upgraded to have a larger reach and from then on the player will need to evade multiple rockets at once and constantly teleport, often in quick, successive bursts (somewhat similar to a jet pack), to dodge the attacks and escape as soon as the exit is opened.

The game contains three difficulty levels, 50 stages, medals for a number of achievements and a speedrun mode that can be unlocked.

The browser version adds an Insane game mode with a set of harder levels.

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