Hard
Number Puzzles
15 XP

Staircase Step Count

21,363 solved 79% solve rate 21% fail rate
Visual blocks build steps: Step 1 = 1 block, Step 2 = 3 blocks, Step 3 = 6 blocks, Step 4 = 10 blocks. How many blocks in Step 5?
Only 79% solve this correctly
21,363 attempts
Earn +15 XP for solving
Quick Answer & Explanation
15 Blocks

The answer to this riddle is 15 Blocks. Difficulty: Hard · Solved by 21,363 puzzle lovers.

Triangular numbers (1, 1+2, 1+2+3, 1+2+3+4, 1+2+3+4+5).
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