Bridge Builder
Build as many bridges at each island as its number says. Bridges never cross, and every island must end up in one network.
Use Tab to pick an island and Enter or Space to select it. Press Enter on a second island to change the bridge between them.
How to play
Circles are islands, and each number is how many bridges touch that island. Connect islands that see each other along a row or column. Drag from one island to another, tap two islands in a row, or tap the line between them. Each tap cycles 0, 1, 2 bridges. Bridges may not cross, and at most two join the same pair of islands. When every number is met and all islands form one network, you win.
Learn more
The clue is how many more bridges an island can still take. An island with 4 and only two open directions needs two bridges in each. Joining two islands that are both 1 would close them off from the rest, so that bridge is out. Directions that would cross, or lead to a full island, drop out one by one.