Tip: Make sure that ALL exit-enabled pipes, doors, etc. have a screen exit defined, or they'll take you to Level 0, the "endless" bonus game. Unless Start+Select is enabled, the only way out of it is to reset the game.
Update: Better Renamed instead of "Poker Solitaire"
My original composition from Casino Jazz Music, Could fit on the hidden/secret levels and overworlds. Likely Abstract, City, and night desert levels.