Layer MAZE is a series of small puzzle games with creative layer-structured maze elements, developed by PipkinGames. Its difficulty is not hard - even a bit low for some players with good memory. However, it can exercise a person's brain energy enough - reaction speed and short-term memory.

Christmas Tree Light Up is a logic-based PipeRoll style small puzzle game. To be honest, this game is really a little humble and old, but when start, you still could not help completing the challenge with one breath.

Open Doors is a Sokoban style (both interface and operation) series of small puzzle games, yet it's a quite another gaming style and concept. Endless changes are derived from its simple design, on the whole it tests the players' logical thinking ability - the chain reaction caused by the every move needs to be considered clearly.

Handbook of Applied Cryptography is one of the best, most classical cryptography books, its three authors are all the internationally well-known cryptographers and active cryptography researchers. This book contains 15 chapters (780 pages), covers all the major achievements in the development of cryptography in recent 20 years.

Our brain controls the behaviors of human body, although we can't understand all its abilities and specific parameters, yet Brain Waves, this interesting small game is able to help you to test them out basically and vividly.