Arithmetic flexibility
Target Number
Four numbers, one target, the four basic operations. Combine two tiles at a time (each result becomes a new tile, so bracketing comes free) and reach the target using all four numbers. Ten puzzles graded from many solution paths to nearly one, every one verified solvable. A staple of trading-firm cognitive assessments.
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10 puzzles, graded from many solution paths down to nearly one. Skipping costs a point; every puzzle is verified solvable.
Performance
This modehighest score / min
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attempts
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