When it comes to strategy games, the more complex is usually better. For instance, most people prefer chess over checkers.
Chess is much more of a challenge, and leads to longer games.
Food Chain is just that kind of game. Food Chain consists of a 5x5 playing field with 4 different creature types. The game randomly picks creatures or actions in the game. You must position the creatures so they will eat each other. It's game over if one creature becomes extinct or the board becomes totally full.