Super Mario Bros. Deluxe
Unused Level Select
An unused level select for the For Super Players mode, judging by the "MARIO 2" text, can be loaded by setting 0xFFB5 to 0x31.
It can load all the levels, including unused ones. You will start with 0 lives and can continue playing after the last level, with glitchy results. By default it will use the Super Mario Bros. level set.
To get it to use the For Super Players level set, activate it on the For Super Players world map or keep 0xC160 set to 0x01. To get it to use Super Mario Bros. level set with the Challenge Mode enabled, activate it on the Challenge Mode menu.