Hello and welcome to the Splinter Cell: Double Agent Speedrun forum, if you are looking into speedrunning this game there are a few differences that you should know. There are two versions of the game (Version 1) which has its own custom engine is on the Xbox 360, Playstation 3, and PC. Then (Version 2) it features an engine similar to Chaos Theory and has Cooperative, While some missions are different the story is the same I'll note which version the Mission is from. I'm unsure which version is faster or has glitches etc. but time will tell on that since I have both versions. if you have any questions please let me know!