@larrylumpy: the radio cooldown is based on your signaller's exp. The higher his exp, the shorter the cooldown. You can also build an antenna to reduce the cooldown slightly.
@ purpl3, to beat nostalgia, I equip disrupt 4 times and break. Disrupt takes away his focus and attempt to take out a buff (the purple buff in particular). That buff describe that Nostalgia will take extra damage, but it's a trap. Just keep using disrupt and break on him and let your 2 teammates pound on Nostalgia. Hope it works for you ^_^
@nabeil: the last hard badge is more time consuming than it is hard. You should have discovered every caves and every castles, plus the coliseum. Butterfly and Cuteybunny are found in random bushes in world 2.
Each rank requires twice as much experience as the previous rank. So you got up to Colonel rank with 50k+ points, you need another 50k to get to Brigandier General. (Note that experience point bar is cumulative)
@ Thecakeisnotalie. If you paid attention to the frequent tips at the top of the screen sometimes they say "soldiers can't see well while in bunker" or "gunners are great in bunkers" or "bazookas can't shoot out from a bunker". Those are your tips and tricks.
Everything was fine until wave 101, from there the Germans sent out a tiger tank or panzer tank every wave. I had to face 4 tiger tanks at one point. They event sent 2 Tiger tanks at one wave :P I got owned hard, but it was fun hehe...
Ok this may sound weird, but one time I tried to use concentrate fire on a zooka, and the game says I don't have a register, but he is clearly inside my bunker, alive :(
I lasted past wave 100 and endured 10 more waves of somewhere around 20 tanks and jeeps rush :) somehow the Germans knew where my signaller was and a barrage of arty strikes pwned him lol.
Things were going well until one SINGLE arty hit my bunker along with 7 of my troops :( what are the chances that single arty bullet hit just my troops cluster? :/
I got to wave 70+, then a glitch happened: one of my bunkers suddenly disappear and my 2 gunners and 1 medic in there died instantly from enemy fire :(. Also second on 2P category, that would pwn :)