Detana! Twin Bee (TurboGrafx)
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Arcade Mode
Press I, II, Right, Left, Right, Left, Down, Down, Up, and Up on controller three. Then, under the options menu, select 'Vmode'.
Level Select
Press Up, Right, Down, Left, Down, Right, Up, I, II, and Left on controller four.
Nine credits
Press Up, Up, Down, Down, Left, Right, Left, Right, II, I at the title screen. Up to nine credits may be selected through the options menu.
See Animation Sequences
Press Up, I, Right, II, Down, I, Left, II, Up, and Select on controller five.
Ten Ships
Press Up, Up, Down, Down, Right, Left, Right, Left, I, II on controller two. You may select up to ten ships in the options menu.