You know Robo Champ, right? It's the only LEGO game that only goes up to 3 players, unlike most others which can go up to four. That's kind of an awkward number, so I adapted the game a little for four players.

More details inside!

For the most part, a 4-player Robo Champ game can work the same as the standard 3-player version would. There are, however, a couple changes you'll need to make to the rules, but first, you'll need an extra robot. Because the game involves trading parts with other players, you'll need to build your robot in a certain way:

1) Make sure that all limb hinges match, with the clip pieces attached to the torso. There's not much you can substitute in this area, so make sure you have enough of the correct hinges. (Just for clarity, those pieces are: Plate 1 x 1 with Clip Vertical - Type 3 and Plate 1 x 2 with Handle on End.)

2) The neck should be two adjacent studs, which the head attaches to from the back, and must be easily removable as heads are also swappable parts.

Beyond those elements, the robot can look pretty much however you like. I also recommend choosing a color very different from the other robots, because of the changes to the die.

Now for the rule changes:

This is simply the same as the standard die setup, only with the large and small white tiles taken away and replaced with tiles matching the primary color of the fourth robot. The new large tile will function just like the red, green and blue ones (which let you take a piece from the pile matching that color). The multi-colored tile side works like the standard multi-colored tile as well as the removed white tile, allowing you to either trade a piece with another player or pick a colored piece from the pile. The black tile (steal a piece) remains on the die as-is.

That's pretty much the only changes needed. I actually haven't tested these changes yet myself, so if you have any ideas, let's hear them.