this is ridiculous. on hard difficulty holding the fort is purely luck based. had no problems holding against a horde with deffence of 170 vs 300+ zombies. yet failed with dffence of 225 vs 285 zombies. like WTF????
easy game if u do it whole in one go . but it turns to nightmare if u save at lvl13 , then come back and are left with half dmged base and only 1k to spend :D
done 13,14 and 15 that way