Game starts very easy; gets very challenging.

Tips to players: Keep clicking on blocks on the bottom row. You'll eventually find a match on the top and having already clicked on the initial block will help you make the small window of time. Also, watch out for those arrows! Many blocks are very similar but the arrows are different.

Bipolar NPN transistor
P-channel field-effect transistor
Bipolar PNP transistor
N-channel field-effect transistor