In previous version, the ai did cheat, sort of. If I remember correctly the ai gets a bonus to experience, gol, hp, and many other stats depending on it's level. Normal had no bonus easy had a negative bonus, and hard and nightmare had a positive bonus (0%, -15%, +15% and +30%, respectively), if I recall correctly. In 2D, the AI seems particularly bad. It seems much worse than in 2C, which is unfortunate considering the issues we are experincing leading to solo versus ai games.