It’s probably best to start with the oldest Vex game on Coolmath Games, Vex 3. This has all of the classic Vex gameplay that you could ever want. Awesome parkour tricks, dangerous traps, and difficult puzzles can be found all throughout the game. Vex 7 is very similar, although it has a few new gameplay mechanics that you might find interesting. This game introduces flying to players, which is definitely a fun and unique experience. Overall though, it will feel very familiar if you have already played Vex 3. Vex: Challenges is slightly different from the Vex games. This one has a more classic platformer game style, with individual levels that come one right after another. If you are more in the mood for a game that has time limits, then Vex: Challenges might be the one you want to try out first.