- The bots on lv. 4 are inadequate with ladders before platforms - they are can going down from their sides, can hang on corner or fall to die.
- All bots and players on lv. 5 cannot dodge the ladder to underground bunker, this leads to teleportion back on ladder. Bots always dodging the ladder from its highest section, but can hang on corner or fall to incap.
- On the lv. 7, bots cannot normally step on platforms as they climbed on top of the ladders - they can stuck and repeat this or jump from ladder to die or incap. Sometimes bots can wander up and down the cliff platforms, forcing teleporting them to me. You cannot shoot zombies and Specials through the cliff platforms.
- The lv. 15 is only on player shoulders (if he plays Singleplayer) - bots unable to jump the barrels. The Smoker on balconies is the most nasty thing because there's very hard to track him, especially watching for barrels and hordes and he can easily caught the player through platforms if Smoker wasn't spotted.
- The last level have a serious navigation trouble on the office roof. Bots always reached to the roof ladder under the office and can easily climb on roof and even tent, but inside the tent and around it they're unable to pull player up if he was downed not near of them. Same thing with another bots.

My recommendations:
- About fourth level - repair the elevator before platforms, remove the blocks, ladders for preventing bots dying or replace this part of level.
- About fifth level - make the ladder again dodgeable or replace it to simple stairwell.
- About seventh level - replace the rope to ladder, make the platforms closer to ladders, wider and shootable through or replace this part of level.
- About eleventh level - make it in gauntlet-style instead of regular level, block the access to outside and make war plane to already waiting the player with saferoom inside with regular red door.
- About fifteenth level - make it easier by replacing the balconies material (to glass, for example), removing some windows or remove them all for making spawns only on the roof and from street. Remove the cart pushing because it wastes time and became more irritant after every level fail or replace the entire level to gauntlet-style map.
- About sixteenth level - improve bots navigation.
- Overall - make lesser the amounts of barrels on levels 3 and 5 for preventing accident shot from bots that can injury or even kill the player, reduce amounts of scripted hordes.

Make this campaign more singleplayer-friendly, please!