Plumbline

Plumbline is a pure logic puzzle. Connect every pair of matching colors with a pipe — but there's a catch: you have to fill every single square on the board. Leaving a gap means you haven't solved it yet. No timers. No lives. No pressure. Just you and the grid. ── 300+ HANDCRAFTED LEVELS ── Eight packs that grow with you, from gentle 5x5 boards to demanding 14x14 grids. Each one is a genuine puzzle, not filler. ── EVERY LEVEL HAS ONE ANSWER ── Every puzzle is machine-verified before it ships: solvable, fully coverable, and with a single correct solution. You'll never lose an hour to a board that was broken all along. ── ENDLESS MODE ── Run out of levels? You can't. Endless generates fresh puzzles on your device, forever, tuned to stay interesting rather than just big. ── BUILT TO PLAY ANYWHERE ── • Works completely offline — no signal needed • One-handed portrait play • Tiny download, runs on older phones • Stuck? Take a hint and keep moving ── SIMPLE TO LEARN ── Drag from one colored dot to its match. Pipes can't cross. Cover the whole board to win. That's the entire rulebook — the depth comes from what you do with it. Perfect for a commute, a queue, or winding down. Train your brain without a countdown clock shouting at you.