Depends on which fuse it is, what it's protecting, etc. Completely impossible to tell from the description. The easiest thing to do is to look at the fuse and get the rating off of it, it'll be stamped into the metal ends. Failing that, the fuse holders are usually marked. Failing that, check with the game's manual (assuming it's a dedicated game). If it's a conversion, there's no telling what was supposed to go in there, so you just have to make an educated guess based on what the fuse is protecting. For example, if it's the main cabinet fuse that goes right after the power cord, then a 2 or 3 amp slow blow fuse would be appropriate. For just the monitor AC fuse, a 1 A slow blow is usually appropriate, etc.
-Ian