The Octagon Theory is an iOS abstract strategy board game like chess, othello, checkers. While The Octagon Theory can be played by two humans via pass-n-play it is mainly designed for one human to play against the AI. It is a universal version for iPhone, iPod Touch, and iPad. TOT TableTop is an iPad-only version of The Octagon Theory that is mainly designed to be place on a table to be played by two humans. But a human player can play against the AI if another human player isn't available. The prices of these two games have been changed: The Octagon Theory: $0.99 -> $1.99. TOT TableTop: $1.99 -> $0.99. The reason the prices have been changed is because The Octagon Theory is universal while TOT TableTop is iPad-only, so TOT TableTop should be cheaper. Also starting now TOT TableTop will be free until July 3rd at which time the price will go back to $0.99.