The Proof! tabletop card game is the inspiration behind our free, online Math Puzzle Challenges. Each carefully constructed puzzle consists of a set of nine cards that hides a challenging equation. If you would like, you can create an account to save your progress. Or if you already have an account, you can log in.

221.
Find a Pair of 22's
222.
Find Any Pair Less Than -100
223.
Find 5 Different Pairs
224.
Find a Pair of 10,000's
225.
Find Any Pair Using All 9 Cards
226.
Find Any Pair Using Addition At Least 4 Times
227.
Find 12 Different Pairs Using Exactly 3 Cards Each
228.
Find Any Triplet Greater Than 100
229.
Find 3 Different Pairs Greater Than 20
230.
Find 8 Different Fraction Pairs
231.
Find 11 Different Pairs Using Only Multiplication and Division
232.
Find Any Pair Greater Than 200
233.
Find 6 Different Pairs Greater Than 0
234.
Find 6 Different Fraction Triplets
235.
Find a Pair of 209/403's
236.
Find 5 Different Pairs Using Only Addition
237.
Find a Pair of 3,375's Using Only Multiplication
238.
Find 10 Different Pairs Greater Than 0
239.
Find a Pair of -30's
240.
Find 5 Different Pairs Greater Than 100