Dr. Jekyll and Mr. Hyde

Considered by most to be one of the worst NES games in terms of gameplay. Not to mention the localized version lacks of a couple unique level backgrounds that are exclusive to the Japanese version, named 'Houma ga Toki'.

This game has a 'better' ending (if we can call it like that) if Jekyll reaches the Street level (last) and the player does the same with Hyde, only that when he reaches Street, the rooftop route must be taken or else you won't get this ending. Why the word better in quotes? Since the regular ending is just the first scene with the chapel background, while the alternate variant of it that is shown in this video, has extra scenes after that.

And finally, the coin bag seems to have no other function except to 'shut up' some singer that appears at a few levels, though you can also wait for her to stop attacking with music notes to pass through (this requires a lot of practice however). As for collecting coins, you can only get some as Hyde in the US version, since one of the characters that gives Jekyll some money was removed during localization.

00:00 - Intro
00:59 - Stage 1 (Jekyll)
03:37 - Stage 2 (Jekyll)
06:37 - Stage 3 (Jekyll)
09:06 - Stage 4 (Jekyll)
14:22 - Stage 5 (Jekyll)
17:54 - Stage 6 (Jekyll)
21:22 - Stage 1 (Hyde)
24:22 - Stage 2 (Hyde)
27:02 - Stage 3 (Hyde)
29:17 - Stage 4 (Hyde)
34:01 - Stage 5 (Hyde)
37:38 - Stage 6 (Hyde)
40:06 - Only bossfight in the game
41:11 - Back as Jekyll
41:42 - Ending