Well , you play them carefully , each one differently , based on what hands you have seen him ,every maniac , to play . If he plays trash hands because he has a big stack you can play a wider range of cards against him , if not wait for Ax high pairs if you need to shove against them . You have to watch your blinds and pick position and cards , less blinds mean more risky plsay against them. If he has position aganst you and he raises/shoves all the time to steal the blinds , its a good opportunity to double your stack in no time . In SNGs they are a pain in the *** for me , although the same rules more or less against them apply ,it' s far more difficult with 5 or 4, on the bubble , bigger stacks shove on the bubble more category cards , but if they are also maniacs , sh** ... they don't stop...