Earlier I was plating Super Mario 1 on the NES. Then the SNES. Then was doing some experiments with the Minus World.
Then I played a little Mario 3.
Then I hacked my Mario 3 ROM and played with the "Super Mario Bros 3 Lost Levels"
http://www.classicgaming.com/tmk/smb3_lost.shtml
Now I just finished a nice round of "Doki Doki Panic" on my emulator.