[Puzzle | lvl 1+] Lucky number 3!

Hey there!

Actually, my lucky number is 12, but this is about the number 3. I hope this giveaway will bring me to level 3 for the third time, when it ends.

The giveaway is for Kingdom Rush. I really love that game, it's great! You need to be level 1 to enter the giveaway.
Please don't share any solutions. The puzzle should be really easy, but if you have questions, please ask. I will try to help you (especially because the formatting was weird for some of the questions. I don't want formatting to stop you) =3.

Good luck!