from Kukulcan:

The game zone is incorporated in a checkerboard of 16 columns * 12 lines or 192 possible cases. Each box is 16 * 16 pixels.

To capture levels, made through the Mega Publisher level created by REPPA site nintendomax.com

The 500 levels (levels 000 a 499)
56 levels from the Arcade: Boxy Boy. (c) 11/1990 Thinking Rabbit / Namco.
163 levels of the Sega Game Gear: Soukoban (c) 1990 Thinking Rabbit / Riverhill Soft.
100 levels - Loma (c) of the Aymeric Peloux / François Marques / David Skinner / Sven Egevad / Victor Kindermans / Michael Steins / Frantisek Pokorny / Arpad Fekete / Roger Delaporte
20 levels - Cosmonotes (c) Aymeric du Peloux
40 levels - Microcosmos (c) Aymeric du Peloux
40 levels - Minicosmos (c) Aymeric du Peloux
40 levels - Nabokosmos (c) Aymeric du Peloux
20 levels - Picokosmos (c) Aymeric du Peloux http://membres.lycos.fr/nabokos

For those who would have counted and who does not have a total of 500 levels, though seen, I supplemented with levels of my creation.

Principle
You are a guardian warehouse (Sokoban), you must arrange the boxes on areas destinations. You can move in four directions and push a single box at a time. Once all the funds row, the level is finished and you go to the next level.

Orders
Moving = Pad or Stylus

A = Cancel displacement (up to 100 trips stored)
B = Repeat level
Y = Choose another level

L = Rasters (yes / no)
R = Music (yes / no)
Start = Return to the main menu
The Options menu
This menu lets you choose among 1 background 6 backgounds different (there are 1 of hidden) and 1 Thursday sprite among 6 possibilities. Below the same level with backgrounds and different sprites.

Changelog:
Correction of 40 levels, a Mollusk thank you and the community PPC (more logically duplicate).