Crystal Gates

Crystal Gates is a series of four 'mission gates' (Mission Gates are basically obstacles that prevent you from attempting a certain Special Mission till you do something, and may even be minigames!) that block the path to Colour Bloon and each require a Crystal Orb to open them, while the last also requires a Colour Orb. Despite not being tracks, these appear in the Tracks section, but clicking them will open a mini game (the ones not reached yet or reached but not enough resources for them will be locked) which depends on each gate.

Crystal Gate 1
This is the first gate, unlocked directly after unlocking the project itself. It is a giant cave wall (showing that a cave was once there) with four broken crystals carved in the wall and with a metal colour, thus making it look like a gate. The crystals need a Crystal Orb to reform it, thus giving them the power to open the gate. The mini game is like this:

Minigame 1

 * There's a monkey without the orb, as it fell down below and the monkey did'nt notice. The orb managed to bury itself deep down somehow, and the monkey has to restore it within 5 minutes (I know, pretty short time). You've got to guide the monkey. The right arrow key is to move right, the left arrow key is to move left, the up arrow key is to jump, the down arrow key is to locate the orb and the left key and the space bar together is to throw something you choose from the inventory. Useful things may also drop from time to time, and you can put them in your inventory by pressing the spacebar. You cannot have more than 9 items in the inventory, as the tenth slot is for the orb.
 * The monkey also has a scanner which is needed to locate the orb. Scanning takes 10 seconds, and the scanning only has a range of locating right below it and you cannot move the monkey while scanning. Also, there's a bloon below too (the Crystal Bloon) that moves the orb, thus making the minigame harder. However, you have a chance to scan three times when the orb is not being moved; a shine can also come where the orb is hidden, and will disappear after half a second! This is also a signal that it'll be moved again after 2 seconds unless it's currently being scanned! (spoiler: the orb's first place is under a small drill put there for the monkey!)
 * After scanning it, you can grab the orb by going deep under (after scanning, the bloon will give up and dig the orb's area for you). Then, simply go to the gate, jump to the middle of the gate and throw the orb to the middle to win and unlock Crystal A5 SECRET.