The Coin Heaven bonus area is found in most Mario games in the Super Mario Series. It appears in Super Mario Bros., Super Mario Bros.: The Lost Levels, and Super Mario Bros. 3 for the NES, Super Mario World for the SNES, New Super Mario Bros. for the Nintendo DS, New Super Mario Bros. Wii for the Wii, and Super Mario 3D Land for the Nintendo 3DS.
In each game, it is secretly located usually in the sky in certain levels and can only be accessed by an hidden item. It contains lots of coins that the player may not be able to collect before being put back into the main level once finishing the Coin Heaven.
In the first Super Mario Bros, it could be accessed from Mario hitting a ? Block that contains a Vine that the player can climb on. He will have to ride along the moving cloud in order to reach the coins before being dumped back to the ground.
It would act differently in Super Mario Bros. 3. Mario would have to find a ♩ Block that is colored pink. Mario will be able to jump on it and jump into the sky and into Coin Heaven. It will automatically side-scroll while the player collects the coins before reaching the pipe at the end. The player can also fly upward and find a ? Block with a 1-Up Mushroom inside of it.