Skull Cove — Climb the relic ladder before the tide takes the cave

What is Skull Cove — Climb the relic ladder before the tide takes the cave

Skull Cove is a chain-drawing puzzle on a seven-by-eight grid of relics inside a flooding pirate cave. The five relics form a fixed ladder — bone, doubloon, gem, key, skull — that then loops back to bone. You drag across touching tiles, diagonals included, and each tile you add must be the next rung up. Three linked relics are the smallest haul the cave accepts, and long chains are worth far more than short ones. A meter above the board tracks the tide, which climbs on every move and drowns the bottom rows one at a time until the cave is full.

The tide is not only a clock. Hauling a long chain pushes the water back, so the board is also your pump: three links buy almost nothing, while seven links with a wrap from skull to bone drain more water than a move at depth one costs. Points, meanwhile, buy depth, and depth makes the tide rise faster. Reach 3,600 points and you are at depth three, where the water gains 0.39 rows a move instead of 0.30. Every relic you cash in shortens the run that produced it, and judging when a chain is long enough is the whole game.

How to play

1. Press Start diving, then drag across neighbouring relics — diagonals count — so each one is the next rung: bone, doubloon, gem, key, skull, bone.
2. Release once the chain holds three or more relics. They are hauled out, the tiles above them drop, and fresh relics fall in from the roof.
3. Watch the tide meter. It rises on every move and floods the bottom rows; submerged relics turn grey and can no longer be linked into a chain.
4. Long chains, skull-to-bone wraps and golden chests push the water back down. The run ends the moment the tide fills the cave to the top.

Strategies that work

• The tide gains 0.30 rows a move at depth one and a chain drains 0.14 × √(links − 2), so seven links is the shortest chain that breaks even; three and four always lose ground. A chest drains 0.4 by itself, more than a move costs until depth four, so it is worth a detour.
• A wrap — skull followed by bone — multiplies the chain's score by 1.5 and its drain by 1.25 at once. That double payoff drops the break-even length from seven links to five. Skulls are the rarest relic, on roughly 15% of new tiles, so build around any skull sitting beside a bone.
• The combo climbs only on chains of four links or more; a three-link haul resets it to zero. The multiplier rises 0.15 a step to a cap of ×1.9, so throwing a full combo away costs six good moves. A three-link chain that breaks a ×1.9 combo is usually the worst move on the board.
• Score is the sum of the rungs times (links − 2), so it grows roughly with the square of the length: four links are worth about 24 units, six about 72, eight about 144. One eight-link haul beats six four-link hauls, and extending a chain never costs you anything.
• Depth is the honest trap: 1 + √(score ÷ 900) rounded down, so 900 points brings depth two and 3,600 depth three. At depth three even seven links with one wrap only break even, and past it the tide gains on every move whatever you do. Spend chests and hunt wraps early.

A little history

Skull Cove was written for Puzzle-Me and has no older tabletop original. Its chain rule belongs to the match-and-link family, where you trace a path through touching tiles instead of swapping two of them, and its ladder comes from modular arithmetic: five ranks, with next meaning rank + 1 modulo 5, which is why the sequence loops rather than ends. The tide gives it the shape of a push-your-luck game, since the chains that earn points are also the ones that raise the depth that speeds the water up. The pirate cave is dressing; the arithmetic underneath decides how long you last.

Frequently asked questions