Akumajou Special: Boku Dracula-kun

Akumajou Special: Boku Dracula-kun is a wacky Castlevania spin-off. Unfortunately, it never saw an international release, unlike the Game Boy pseudo-sequel Kid Dracula.

Anti-Piracy
As with most games Konami published since 1990, this game features a copy-protection routine. It checks for the presence and integrity of the CHR bank containing the copyright and "KONAMI" tiles, the packed tilemap containing the string "&copy; KONAMI 1990", the first byte of the JMP opcode that calls the routine that displays the copyright information on the screen, and the first byte of the JSR opcode that calls the protection routine itself.

If any test fails, the game removes all non-player sprites starting from level 2. This renders level 2 itself impassable, due to the removal of several rotating sprite platforms.

Easter Egg
At the title screen, entering the Konami Code (Up, Up, Down, Down, Left, Right, Left, Right, B, A) will give a tone for correct code entry. Pressing Start, however, gives you nothing more than a mocking message.

Build Date
Present at the end of the PRG ROM: V0.0890810 While the build date (August 10, 1989) is clear, why would they list it as Version 0.0...?