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.

81.
Find a Pair of -18's Using Only Subtraction and Division
82.
Find 8 Different Pairs Greater Than 0
83.
Find a Pair of 1,000,000's
84.
Find 5 Different Pairs
85.
Find a Pair of 97's
86.
Find 9 Different Quadruplets
87.
Find 11 Different Pairs Using Only Addition
88.
Find a Pair of 50's
89.
Find 10 Different Pairs Using Exactly 3 Cards Each
90.
Find Any Pair Greater Than 100
91.
Find a Pair of 24's
92.
Find 3 Different Triplets
93.
Find a Pair of 11's Using the 100 and Only Subtraction
94.
Find 12 Different Pairs Using Only Multiplication and Division
95.
Find 2 Different Triplets Greater Than 500
96.
Find a Pair of 12's Without Using Subtraction
97.
Find Any Pair Less Than -100
98.
Find 4 Different Triplets
99.
Find Any Triplet Greater Than 100
100.
Find 2 Different Pairs Using Only Division