Daily Challenges are garbage , should be removed , took my 5/5 rating I had given to a 3/5. If challenges were remotely possible Game would still be 5/5. Won't be back till this is rectified , mods should also try and play these challenges to see if they are possible before posting as well.
Afer trying this game out for a few hours I have realized how horribly unbalanced this game really is , Zone 17 should not even be in this game to begin with and it would help if the walkthrough actually showed the correct way to do the zone , after copying what the player did in the walkthrough I was still unable to defeat zone 17 after an hour , would give it a higher score than 2/5 but this zone breaks the game. Food for thought.
would give a better score than 3/5 but game is unbalanced after wave 10 , flying bears require 2 sets of AA guns with no way to make the amount required to do so and still defend , good game overall but needs some work still.