You don't need any switches to prevent feedback on the 3rd design... X only gets current if they're all on, easy enough to do, and Y gets current if any of them are on - make 4 "OR" gates in a row with VCC on one end - turns off if any of them are on. You know where to go from there.
AND gate attached to VCC seems to be the best way of preventing feedback though, if you still feel you need it.
Good game :)
Pretty obvious you don't have much experience in flash, lots of little things that could easily be polished off (if you get dodge higher than 14 nothing can hit you ever for one), but it more than makes up for that with good artwork, logical puzzles, and a storyline that's actually interesting - I really wish more people would write a story to go with the game, it makes it so much more interesting, especially with point-and-click. I mean, it's not like I'm playing this for the puzzles ;)
http://FantasticContraption.com/?designId=1926436
Sickest catapult ever. Looks like it works a little too well though...
Hmm, adjust the scoop...
Ahh
http://FantasticContraption.com/?designId=2160303
Perfect
Ok, I give up. I got STUCK in the diary the first time, so I checked it out on Armor Games. THERE I could only turn ONE PAGE!
I figure I'm not meant to beat this game.
Personally, as far as zombie games go, I'd say this is a pretty good one. I'm glad it has a goal, and you actually have to find things instead of buying. Don't really see what the cash signs are for though.