This game was written while watching Shallan's 16-hour charity steam in which he built the C64 game 'LUMA', and raised over $1,200 for Extra Life. If you like this game please consider also donating to the cause he is supporting using the link below:

Shallan's Extra-Life Marathon

The blocks continually scroll from right to left. You can move your block on the left to any path you like and then press fire to launch it down the path. If it stops next to a block or blocks containing the same number, they will merge to create a block of double value. Each extra block merged doubles the value further, and newly merged or moved blocks can also combine with blocks next to them to create long chain-reactions. The game ends when any of the blocks reach the left hand side.

Press 'M' to toggle music on/off.

  • Written in KickAssembler using Sublime Text, CharPad and SpritePad. 
  • Music by Richard Bayliss (reworked slightly to free up channel 3 for SFX - sorry Richard!)
  • Testing by Michael Streleski (if there are any remaining bugs this is down to my impatience to finally get this out of the door!) 

  • Thanks to @James for his superb browser-based C64 emulator/debugger available at

Rated 4.8 out of 5 stars
(6 total ratings)
GenrePuzzle, Action
TagsCommodore 64


merge64.d64 170 kB
merge64.prg 7 kB


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(2 edits)

Fabulous game and my wife really likes it. Very addictive! One thing though is there is a little bug we think whereby after a series of numbered squares have come off, you can be left with a long line of new numbers which have been created (normally in the centre row) and other rows are normal or have shrunk as you would expect. It only occurs occasionally and when lots of quick calculations are needed.

Neat game! Would be nice if the music stays mute once switched off though (and not turn on again after a game over)

Good idea - I'll put that in over the weekend

Nice game, and small gameplay:

Thanks as always for the video :)

Nice game, also no problem regarding the music reducing to 2 channels. I have no issue with that ;)

Thanks Richard, appreciate that. One day I will finish my 'modern' tracker and write some myself, I just cannot get on with Goattracker!

very nice, with compliments

Thanks very much :)