VCMI is an open-source engine with a different AI.

Hiding explored territory after building a structure in "Inferno" and "Necropolis" castles doesn't work. Also, "flight" and "teleport" seem to work incorrectly compared to the original game. Teleportation is only possible to open, "explored" territory. After a certain time while playing on a tablet: the game freezes. Waking up from sleep requires sliding the screen panel down. Maybe this only happens to me!