At the options screen, press Select, Start, Select, Select,
Start, Select, Select, Select, Start, Select, Select, Select, Select, Start. The words "Arcade Mode Unlocked" will appear over the game logo. When you
start the game, you'll play the original arcade version.
After diving in the water shoot all the barrels for a bonus stage. In the under ground mine shoot a rat crossing the pipe for another bonus stage.
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Thanks to Revolution readers Jeffrey Wertz, Spazm and ElvenPower!