I really like games where I can modify the world or change the play style. Either games that allow you that allow building (Roller Coaster Tycoon 1 and 2), or games that allow total world control (Garry's Mod). Even free to travel games that have some power mods (Fallout3). I also like games that allow for custom skirmish, I like having editing features to play against the computer (CS:Source, UT2K) to make random games or strange rules. I've been looking for some new games that fit this type either from Steam or retail. I found some like Trainz 2010, which looks promising but figured there must be some others that offer some functions of customizing the world, rules of the game, or allow this by mods. There's lots of mod creation tools for games but I'm more of a person that wants to have a just a GUI menu how to change the game rather than edit lines of code. Any suggestions?
Any help will be apprecited.
I didn't find the right solution from the Internet.