You need to complete all of the red planet achievements to unlock the candy drill. For the agile one you just need to avoid the orange blocks, bug nests and laser turrets - being hit by the laser beams and bugs is fine.
The lost messages come from the question mark blocks - I think they just turn up randomly.
Well this game is crap. The tutorials are really cumbersome e.g. they tell you what to do and even point at the thing you are meant to click on but you can't do it until you hit next.
I've found a bug. I got a mole at the exact moment my time ran out and it brought me back up the start position but didn't reset so I couldn't do anything.
Has anyone managed to get Brilliant on the last four levels? I've got three stars on the first 17 levels in day mode and the first 16 in night mode but I just can't crack level 18 and upwards.
I've discovered that if you're just grinding (I needed to redo a map to get the last upgrade) then the game runs a lot faster if you switch to another tab in your browser which is great if you're just waiting for your towers to level up.
How on earth does this game have almost 4 stars? It takes forever to buy upgrades. I managed to buy a groupie, upgrade my wheels and get some rockets so figured that I probably had enough airtime to do the up and out trick twice. I missed by a fraction of a second and they killed my groupie. If this game has put anyone off this entire genre of game then they should go have a play of Learning to Fly 2 which is brilliant.
 "Reach the core"){kind=icon}
 "Furious Towers"){kind=icon}
 "Dig To China"){kind=icon}
 "Cursed Treasure 2"){kind=icon}
 "Hands of War Tower Defense"){kind=icon}
 "Shopping Cart Hero 2"){kind=icon}