For today's genre, we're back on the Inaba train! The type in question is Touch Match. I came across this type earlier and wanted to write a spotlight for it, but one of the puzzles written for the blog became more difficult than anticipated, so it appeared on the 2025 USPC instead. Many of Inaba's genres use "blocks" rather than "regions", and this is no exception.
Rules: Place triominoes (connected three-cell regions) along the gridlines so that they do not overlap and each contains exactly one of the given circled numbers. For each triomino, the number of neighboring triominoes that share an edge is equal to the contained number.
Two smaller puzzles today. First, the example sent with the USPC puzzle. Normally I try to avoid 0 clues, but they felt necessary for the example.
Second, a grid I constructed several months ago. There are a few subtle steps here.
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