How to play Sumrex (prototype)
Sumrex is an early prototype of a MinCalc logic puzzle. The board is 6×6 and divided into six coloured regions. Every cell holds a digit 1–9. Your job is to select exactly one cell in each row, each column, and each region, with no two selected cells adjacent (orthogonally or diagonally) — and whose digits add up to today's target.
There's exactly one selection that satisfies all four rules and hits the target. Each cell cycles on tap: empty → crossed → queen → empty. Use crosses to mark cells you've ruled out (e.g. "no queen can have digit 9 given a target of 14"), so you don't re-consider them.
Press Check once you've placed six queens. If the placement is valid but the sum is wrong, the board stays and you can adjust. If you get stuck, Reveal solution shows the answer without penalty — this is a prototype; there's no leaderboard, streak, or completion lock yet.
What we're testing with this prototype: does the combination of Queens-style placement (one per row/col/region, adjacency) plus a numeric sum target produce a deduction flow that feels satisfying rather than tedious? Feedback very welcome.