Every board on this site can be cleared. When one dies, the cause is almost always one of four specific errors, and all four are avoidable once you know what to watch for.
Error one: splitting a set of four
The most common killer. Two identical tiles are free, two are buried in separate stacks. You take the free pair, and now the remaining two must both surface — and if either stays blocked, the board is dead.
The fix: before matching two of a four, find the other two. If they are in different deep stacks, the free pair is safer to take now. If one is about to be uncovered, wait and match across layers instead.
Error two: spending the always-free tiles
The protruding tiles on the turtle's sides are free from the start and stay free. They are the closest thing the game has to a spare move. Taking them in the opening feels efficient and removes your safety margin for the rest of the board.
Keep a reserve
Aim to reach the last twenty tiles with at least one pair you know is still available. Without a reserve, one bad choice ends the board.
Error three: clearing one area completely
Focusing on a single region until it is empty concentrates the remaining tiles elsewhere, which means more of them are blocking each other. Spread your removals across the board so the stacks come down evenly.
A practical version of this: after every few pairs, deliberately take a pair from the part of the board you have been ignoring.
Error four: playing fast in the late game
The first fifty tiles are forgiving — there are usually ten or more playable pairs and most choices work out. The last thirty are where boards die, because the pair count is low and each removal matters.
Slow down when the counter drops below five. At that point it is worth checking every available pair rather than taking the first one you see.
The warning signs
- The pairs counter falling steadily over several moves rather than staying level.
- Several tiles of the same face all visible but none matchable.
- One deep stack remaining with everything else cleared.
- Most of your removals coming from the same corner of the board.
Recovering
If you reach a dead end, you have two tools. Undo steps back pair by pair with no limit, so you can rewind to the decision point and take a different route — this is the better option when you know roughly where it went wrong.
Shuffle redeals the remaining tiles into a fresh solvable arrangement. You get three per board. It always works, but it resets your reading of the position, so it is a last resort rather than a first response.
A checklist for the late game
- How many pairs are available? If under five, examine all of them.
- For each pair, what does removing it free?
- Where are the other copies of each tile I am about to remove?
- Am I leaving at least one guaranteed move for next turn?