One of the largest problems with the Quest Mode – an essential part of the game if you want to get better cars and upgrade the ones you have – is that you only ever unlock one course at a time and have to earn a medal on each of the beginner missions before you can move on to the first intermediate difficulty level course, where you again have to go one-by-one to get to the next difficulty level. It is not that it's hard to earn a medal on any of the courses; quite the opposite, it is incredibly easy and the fact that you can't simply move to a more worthy difficulty level without spending hours on the easier difficulty levels is frustrating.
In addition to also having an Arcade Mode which allows you to do all manner of races (though it seems as though more difficult courses there are only unlocked after unlocking them in Quest) and still earn points to buy new stuff, the game does offer an online mode, but you can't cheat the system and get more worthy opponents by going online. You can set the online mode to only go up against friends, but if you venture into the larger online section, it's neither ranked nor does it allow you opt to only allow the usage of cars without mods that have been earned in Quest Mode. Thus, when you go online, you have to do so with relatively suped-up cars because the people you're going up against will have them. That means you need to go through Quest Mode; don't and the game goes from being not competitive due to its ease to not competitive due to its impossibility.
The issues with Supermini Festa! don't end there however. Oh no, the cars have horrifically jagged edges, and despite their being 16 customizable rides, due to the poor graphics a whole bunch of them look pretty similar during races. Cars jump in ways that can't possibly happen (they almost feel like RC vehicles when they do) and, more disturbingly, have the ability to go through many a tree as though they weren't there because apparently many of them are nothing more than mirages. Other trees do actually exist, but only in order to push your car to one side or another, they never actually cause you to crash. That's okay though, because even when you crash in a race it costs you very little – just a few seconds and sometimes your opponent won't catch up to you even when they weren't all that far behind prior to the crash. Go ahead, hit walls, cones, trees, rocks, other vehicles, whatever you want – if the crash doesn't completely reset you with minimal penalty, it causes no damage whatsoever.