Basically, this is the arcade port of Super Mario Bros. There are minor changes in most of the levels, and some are even hacks of Super Mario Bros. 2 (Japan) levels. The changes include:

• More enemies added in most levels
• Bug fixes/preventions
• Less warp zones
• New required paths in "maze levels"
• Less power-up and 1-up chances

As you can see, it's a bit tougher (the idea is to take quarters from the kiddies, remember), but SMB veterans shouldn't have too hard of a time here. Though VsSMB is a step up in difficulty from SMB, it is definitely not as hard as SMB2(J)...

Screen shots

• A bit different...