Brain Lab
Competitive Training
A corner of NumberPrism for pure logic. Daily KenKen grids that train speed, accuracy and the mental arithmetic behind every calculator on the site.
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Available Challenges
no loginDAILY PUZZLE
New at midnight
Daily KenKen
The ultimate arithmetic logic puzzle. Fill the grid using math cages — no number can repeat in any row or column.
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Speed Math
Race against the clock in a mental sprint. Complete operations in under 60, 120 or 180 seconds.
Complexity: High