DoDonPachi Maximum Cheats - iPhone
Orchid Ship - Complete Stage 5 (any) using Tigerschwert.
Tigerschwert Ship - Complete Stage 5 (any).
Unlock Special stage
First, unlock stage 5E (you don't have to beat it), then turn on easy mode again and enter the level select screen. Despite easy mode normally being limited to A-grade stages, 5E can now be played as well. It's not the same as normal mode's stage 5E, however, but a hidden bonus stage.