File this one under brain training games: Math Mountain is an addictive arithmetic game wherein you climb a mountain, competing against another person or the computer, by answering math questions correctly. If you're not very good at arithmetic, Math Mountain is a fun way to practice; if you're already good, then why not give your brain some exercise?
Blobular is a free online clone of the PSP physics game Loco Roco. Tilt the game world left and right to guide the gooey blob around each stage, collecting fruit along the way. It's a fantastic way to experience the quirky style and gameplay of the PSP game without spending a single cent.
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