In this game, you start with seven numbers, and the aim is to combine them all into one target number.

Numbers are combined using the normal +, −, × and ÷ operators. To use an operator, tap or click it, and it will act on the two adjacent numbers. (Where it would matter, you'll be asked which way around to put the numbers.) Along the way you might make fractions and negative numbers, but the target will always be an integer.

In this example, we start with 8 + 6, giving us a 14; then we do 14 ÷ 7, giving us a 2, then we add the 6 and the 7 to get a 13, then we do 3 - 5 to get a minus 2, and finally add that to the 13 to get the target number of 11. There are other ways to solve this.

Ophex is © 2025 Andrew Taylor.
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