ZLIB? The zlib of this and zip is not a thing :) This is our game under the 99 years. At that time, it was already supporting 3D acceleration card rendering 2D game, the picture below is a puzzle game, support software simulation and hardware Rendering, 2 ways, where hardware rendering D3D, software mode is doing it yourself, some effects can not come out (with scaling alpha, this is not implemented, 2D games are not very common in function, but also consume Very bigby) Because of the software simulation, it is mainly a zoom, alpha function, useless 3D rotation, more time :)