Puzzle mode is the ultimate test of memory. There will be 30 levels at launch, and if anyone actually complete them all I could be convinced to create more :)

There are some strategies you can use however, for example mirroring parts of symmetrical loops.

The pieces are removed at random, so quickly restarting the level might make it easier (or harder!) and you don't have to complete the exact same loop as shown, so long as you use all the pieces.