About Sumrex
Sumrex pairs two rules that don't normally meet — one rex per row, column, and colour region, none of them touching, and a single shared sum. The grid hides a digit under every cell; place all six rexes and the digits beneath them add up to today's target.
Read the full Sumrex rules for what counts as touching and how Check works, or browse past Sumrexes — every puzzle stays open for replay. Like Sumrex? Try Targle, where the same target-given pattern plays out on a six-character equation rather than a grid.