When it comes to mobile spin-offs of iconic series, there are a lot of ways they could go wrong. It might not be possible for the genre to adapt well to a touchscreen device or free-to-play model. The King of Fighters Allstars is one of those games that gets around such issues in some rather smart ways. The result is a game that feels like it pays tribute to the series, without trying too hard to mimic it or straying too far from the formula.