How to Win a Free Game in Mr. Do!

This video was taken using MAME, and the first part of the video is run at high-speed so it won't take forever. The video starts right after a power cycle, and the demo is allowed to run 11 times. Then we watch at normal speed the 12th round, and a quarter is inserted exactly when Mr. Do! eats the center prize. The game is started and the first apple that drops gives a diamond. It works every time.
Directions: Power cycle the game, then let the demo run through 11 times completely. On the 12th demo round, put in a quarter exactly when Mr. Do! eats the center prize. Start a game. Loosen the first apple to the right, and if you have done everything correctly, a diamond will appear and you win a free game. NOTE ** The Dip Switch setting for "special" must be set to easy.**

[@jrtwine]

Very nicely done!

[@MxArgent]

Interesting...Universal appears to have forgotten about the super ball sprite in the diamond animation; It's still using the early 'snowman' Mr. Do from the prototype ROM and early promotional material.

[@ThunderFist1978]

Nice find! I never knew about this!

[@lucas66568]

i've got a free credit to the next level once

[@ClassicTVMan1981X]

I wish someone would do the correct algorithm to bring up the Diamond for the ColecoVision port of this game.

[@The1SilverShadow]

What the....!! I've been playing Mr D for 40 years and this hack is by far the best,

[@lucas66568]

thus you will only get 8000 points!but no credit!playing in there is free

[@8BitRetroGamer]

amazing!!!!!
five star!!