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.

61.
Find Any Triplet Using At Least 8 Square Roots and No Addition or Subtraction
62.
Find Any Triplet Using At Least 30 Square Roots
63.
Find a Pair of 74's
64.
Find 3 Different Pairs Greater Than 20
65.
Find Any Triplet Less Than 0
66.
Find a Pair of -3's Using Only Subtraction and Division
67.
Find Any Pair Less Than 0
68.
Find Any Triplet Using Only Addition
69.
Find a Pair of 5's Using All 9 Cards and No Subtraction
70.
Find a Pair of 2048's
71.
Find 6 Different Pairs Using Exactly 4 Cards Each
72.
Find a Quintuplet of 11's
73.
Find Any Pair Greater Than 0 Using All 9 Cards
74.
Find 6 Different Pairs Using Only Addition
75.
Find Any Pair Greater Than 100
76.
Find a Pair of 1's Without Using Division
77.
Find 3 Different Pairs Greater Than 0
78.
Find Any Triplet
79.
Find 5 Different Pairs Using Only Addition
80.
Find a Triplet of 6's