David Cordeau, a math and coding teacher at Roslyn Middle School in East Hills, was convinced that the key to unlocking algebra was making it fun — that way his eighth graders could crack complex concepts and tackle tricky word problems.

That’s why Cordeau, 45, of Massapequa, came up with the digital Venn diagram-themed game Venn Ten , which uses overlapping circles to show comparisons and contrasts between two or more concepts. Players sort nine words into three categories and then are asked to come up with a word that fits all three categories to solve the puzzle.

“Instead of teaching it [algebra] the normal way this past year after winter break, I thought, ‘I’ll try some sort of word association that makes it challenging and fun,’ ” Cordeau recalled. “All of a sudden, it hit me li

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