For the hard badge, if you're as bad at juggling as I am...
Divert the critters from the left up to the top, make all critters go around a bash tower. Then put a big block of squirt and swarm towers below this, with one or two frost towers for added awesome. On hard you should only need a 3x3 block of squirt/swarm towers for no leaks. On the 100, I don't know if no leaks is possible, but you should start the same way before extending downwards.
@ BloodMuffin, it sounds like you forgot to put a '.' between healthMeter and Bar. You're referring to .bar inside .healthMeter, not .healthMeter or .healthMeterbar when you want it to scale down.
In answer to a question posted a few pages back, which hasn't been answered: teardrops are pretty much useless for your main damage dealers, which should be pure water or thunder towers. Throw them away on level 5 impures and they essentially gain a 50%/5types of shrooms = 10% boost to damage (useful for snipers or triple damage, but not much else.)
Last achievement is annoying but no need to rate something down for being poorly badged (It could have been 57/58 badges...but nooooooo). 5/5, really entertaining timewaster
Initially rated it a '4', because despite glaring gameplay flaws it was quite fun. After seeing the message telling Kongregaters to 'grow some '80s nads' - because of course, your game has no flaws in execution or design - I downrated it to a 1.
"Speed for block? Are you mad? It has to make SOMETHING faster"
Yes. It makes your reactions faster, so you can block a little more, deal a little more damage, and be a little more accurate. What it DOESN'T do is increase your speed.