Bridges· Advanced

Goal

Connect all islands with bridges to form a single network.

Rules

Each island's number tells you exactly how many bridge segments must connect to it.
At most two bridges can be placed between any pair of islands.
Bridges run horizontally or vertically only, and they cannot cross each other.
All islands must be connected into a single unified network through the bridges.

How to Play

1️⃣Tap the space between two islands to place a bridge.
2️⃣Tap again to upgrade to a double bridge.
3️⃣Tap once more to remove. (One tap to add, upgrade, or remove)

Tip

Start with high-numbered islands (4+) or islands on corners and edges — their possible connections are more constrained.
If an island has only one reachable neighbor, all its bridges must go there. Use this to make forced moves first.

Bridges puzzles train graph-based spatial reasoning and network connectivity thinking. Structural problem-solving of this kind activates planning functions in the prefrontal cortex and exercises working memory.

Unterrainer, J.M. et al. (2004). Planning abilities and the Tower of London: is this task measuring a discrete cognitive function? Journal of Clinical and Experimental Neuropsychology, 26(6), 846-856.