following the icade atari and taito has released their respective versions: the "atari arcade" and the "invadercade". the atari arcade connects through a standard dock connector instead of through bluetooth. the atari arcade only works with the atari’s greatest hits app which offers 99 games for $10, although it has been criticized as having flimsy controls. taito's space invader themed invadercade functions as a charger while the ipad is plugged into it. additionally, the invadercade has built in speakers and a dedicated volume knob, and can function as a general media center with its itunes and internet radio functionality. compatible with both the ipad and ipad 2, the invadercade similarly requires the taito's space invaders hd app to run.