Super Nisqually

Super Nisqually  is a puzzle game from 2002, where your task is to remove a certain number of blocks from the playfield while evading dead ends.

Instructions
A level consists of a square playfield, like 8 by 8 rows (level 1), which is filled with many different coloured blocks. When you select one block, you can exchange this block with any of the (max) 4 adjacent blocks. As soon as three identical blocks are aligned in a horizontal or vertical row, they will be removed. Once you removed the significant amount of blocks (i.e. 56 of out 64 at level 1), you have the possibility to reach level two (and then so on) once all possible combinations are made. But when you made all desirable combinations before you reach the crucial amount required, the game will end.

There are two situations, where you run into a dead end. When there are five blocks of a kind left in the playfield, but you just combine three blocks, those two can't be removed anymore. Situation two arises, when you deplete a horizontal row completely, in this case, you have a gap, which will divide the playfield into two playfields, and each will be separated until the end of the level.

In each level, you have all the time you want. However, the quicker you are, the more Bonus Points you get. Those are counting down. So if you take too long, they are just zero.

The distant you progress in the game, the more equal will be the crucial amount and the total amount of blocks, but also the huger is the bonus points.