Rat Climber

Rat Climber is a platforming game in which you play as a rat climbing toward the top of the world. You cross vertical labyrinths and make jumps between ledges; one mistake can send you tumbling down. The game has three modes, two worlds with 12 zones in total, and one hidden piece of cheese in each of the seven levels in Ratty's World.

Climb through the worlds

Ratty's World contains the original seven levels: Seaside Village, Crystal Mines, Cypress Swamp, Ancient Egypt, Mystic Towers, Cloud Temple and Shadow Castle. Dream World adds five bonus levels: Kraken Cove, Tempest Tavern, Playground, Foggy Fortress and Lush Ruins.

The game's objects have exact, one-to-one collision, so you can fit through small gaps and stand on narrow ledges. Signs left by Ratty's ancestors offer advice and encouragement; look for their golden sparkles. You can walk, jump and dash, with the dash letting you jump farther. Safety walk prevents you from walking off ledges.

Choose a mode

• Beginner: The checkpoints menu lets you create custom save-load checkpoints, and three checkpoints are provided in specific places in the world. Achievements are not specified for this mode; you can take your time learning the route.
• Normal: Checkpoints are disabled, and achievements are enabled for reaching the end of each world.
• Speedrun: The checkpoints menu and superjump are available; superjump lets Ratty fly and can be disabled. You can also restart at any of the 12 zones across both worlds.

Find the secret cheese

Each level has a single secret cheese, hidden away from the main route. There are seven to find in Ratty's World.

Speedrun tools

The overall timer starts when Ratty moves and stops when you reach the game's final spot and lose control of Ratty. Individual level timers record both split times and segment lengths as you reach new levels, without requiring you to operate a separate timer. Custom save-load checkpoints let you practise difficult sections or skips, and you can restart at a specific level rather than returning to the bottom of the world. A restart hotkey requires two presses to prevent accidental restarts. The game also has an official speedrun website board with moderators, rules and runners.