Sorry, if I sound like a noob, but I can't figure, how to beat the Sinister Water level. I usually capture middle island, and few other islands fairly quickly, but when it comes to taking down the two last islands, I get stuck there- enemy usually has a large army stack, which beats back my troops.

"but when it comes to taking down the two last islands" why arent you just simply build up a stack. when they only controll 2 islands.. it means you controll the rest. And its Multi Attack. the AI cant defend it from everywhere.

I usually try to expand as fast as possible, in order to break their bonuses, as I don't want them to build up large enough stacks. Issue isn't conquering territories, but holding them, as holding them without local bonuses, and only 5-10 reinforcements might be pretty hard, if you have a multi-front war. I will try to beat it today.