Number Islands logic — free online or as a large-print book
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Fill each outlined region with 1 to its size. No two touching cells (even diagonally) may share a value. Tap a cell, then a number.
How Suguru works
Suguru (also called Tectonic or Number Islands) divides the grid into outlined regions. Each region of size s must be filled with the numbers 1 to s, each exactly once. The extra rule: no two cells that touch each other (including diagonally) may contain the same number. Each puzzle has exactly one solution reachable by pure logic.
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Prefer paper?
Large Print Suguru — 110 puzzles per volume (Easy to Hard), as a paperback (also in German).