Aero the Acro-Bat 2 (Genesis)

Aero the Acro-Bat 2
Developer: Iguana Entertainment Publisher: Sunsoft Platform: Genesis Released in US: 1994 Released in EU: 1994 Released in AU: 1994 This game has hidden development-related text. This game has a hidden level select.

Level Select

In Options, highlight the Sound Test and press A to play the following sounds: 8, 4, 19, 71 (likely a programmer's birthday). When you begin play, pause and press Down + A + C to open the Level Select menu.

(Source: GameFAQs)

Energy and Lives

On the Level Select screen, press Left, Right, A, B, C, Up, Down, Up to add additional options to toggle infinite energy and lives.

(Source: Hacc, JLukas)

Unused Text

Starting at address $02C5E4 is a set of strings RECORD and PLAYBACK. No programming was found to load them. They were probably from a removed development feature used to record the demo movies.