123 Puzzle is a number quiz where you have to prove your skills. If you don't know how to proceed, you can get advice or instructions on what to do. Learn through numerous levels and become a top mathematician. In each sequence, one number will be replaced by a question mark. Can you look carefully at the sequence of numbers and determine which number is missing? This is a game for real math fanatics who love a challenge. The first few levels are easy, but the later levels get harder and harder.

Solutions:
1) 1,2,3,4,5,6,? [7]
2) 2,4,6,8,? [10]
3) 1,3,5,7,? [9]
4) 1=1, 11=2, 111=3, 1111=? [4]
5) 1=5, 2=10, 3=15, 7=? [35]
6) 1,2,3,5,? [8]
7) 2,1,3,1,4,1, ? [5]

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