You can play KrewClassic.io in a99.io as unblocked.
The KrewClassic.io game is the same as the Krew game, but there is a system that must be a member in the krew.io game. There is no such system in KrewClassic.io. You can change your route by using the "W, A, S, D" keys. Try to fight against your opponents by using "Left Click". The more opponents you destroy and score points, the better your ship will be. Since everyone is alone in the game, you have to be very careful.