Chalvo 55 Haven't touched this one in months but I do have two of the game's eight stages finished. I plan to resume work on this in late January after I knock out a few more Atari FAQs.
Q billion Just checked and I haven't touched this since March of 2015 :( I started that stupid guide way back in 2003 (not a typo) and have only gotten up to level 30 (out of 100). It's a tricky sokoban variant where you try to match up different types of crates. The difficult part is that the crates can be stacked several layers high so you don't know what you have to work with until you're already well into the puzzle. After I finish Chalvo 55 I'll try to conjure up some motivation to get this done.