Solvable logic & spatial puzzles — the design showcase.
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Art & vibe — Clean grid, high-contrast pieces. If color carries meaning, say how color-blind players can still read the board.
Mechanics — One rule players can repeat in one sentence (slide tiles, match pairs, route pipes). Avoid stacking unrelated systems.
Game loop — Teach with 2–3 tutorial beats, then escalate. Clear win state per level and a satisfying solve animation.