Wow Tombstone and BYOB (tread) had a major overhaul . Tombstone is faster and weapon is destructive to the point can break parts . BYOB is a strong pusher now and the spinner weapons now have a voice they can hit hard and the egg beater can flip some bots . Hope Hexbug will accessorize to build a structure around the Arena so parts dont end up hurting someone or being lost or broken . The Arena spinner is noisy . The size and look of the Arena is realistic enough to the original BB Arena . All in all a very nice set to maximize the feeling of Robot Fighting Time !