LDiabolo and JayEmEf, here's an fix for the freeze I accidently discovered:
I went to '+' rate yr comment after it also froze for me, but I wasn't logged in. Because of this Kongregate blanked the game and brought up a login dialog. After closing the dialog the game came back and had unfrozen. Weird but true!
Would have said this is excellent, but it is completely spoilt at level 49 by introduction of a real-time element, having to start erasing and re-placing pieces at speed during a run. Game designers note: I play these type of games because I like a logical challenge. If I want arcade I'll play an arcade game!!
DingoTM - think you'll find it's you who's the idiot. Spitters ARE meant to bounce through corner-touching or half block walls. DTD works precisely the same way.
Having said this, there IS an unrelated bug where the occasional creep (of any type) just drifts in a straight line over towers like a ghost. They can even miss their exit and stop the game ending!!
Here's a handy tip to get your mouse on auto-fire. Hold down the left button to start firing and drag out of game. Let go of the mouse button and return it to the game. Hey presto: you are on auto-fire. Also helps to build up points :)
Great version of picross and unlike some other's here the puzzles are solvable without guessing. Sadly I can't play it properly as the numbers hop onto the grid for the larger games, and for 25x25 I can't even see the whole grid. Hope this gets fixed.