Super Road Items

Super Road Items are just like Road Items, but there's a lot of them which are bought/upgraded with Monkey Money and have different amount of levels. Their placing price increases slightly with the upgrades.

Road Spikes
Is unlocked at the beginning. Costs $25 to place.
 * Level 1: Can pop up to 11 bloons without lead properties. Free
 * Level 2: Can pop up to 21 bloons without lead properties. 50 MM
 * Level 3: Can now pop Lead Bloons; turns into red hot road spikes. 25 MM
 * Level 4: Now deals more damage to MOAB Class Bloons. 75 MM
 * Level 5: Lasts longer (three rounds) before disappearing instead of just one round. 50 MM

Exploding Pineapples
Unlocked at Rank 2. Costs $20 to place.
 * Level 1: Explodes after 3 seconds and only pops 1 layer. Free
 * Level 2: Explodes after 2 seconds and pops 2 layers. 15 MM
 * Level 3: Now pops 3 layers. 20 MM
 * Level 4: Explodes after 1 second. 30 MM
 * Level 5: Explodes instantly upon being placed, and can pop 4 layers. 50 MM
 * Level 6: The explosion's range is increased slightly, and can now pop 5 layers. 75 MM

Monkey Glue
Unlocked at Rank 5. Costs $35 to place.
 * Level 1: Only slows down 20 bloons before wearing out. Free
 * Level 2: Slows down 40 bloons before wearing out. 35 MM
 * Level 3: Can now slow down Ceramic Bloons and some MOAB Class Bloons. 50 MM
 * Level 4: The glue is now corrosive. 65 MM
 * Level 5: Now lasts three rounds instead of just one. 75 MM

Magical Black Hole
Bought with 200 MM for permanent use afterwards. The two portals cost $40 to place.

Upon selecting it, you need to place two holes at different places. The hole that is the farthest from the track's beginning is the main hole, and the one the closest, is the secondary hole. Bloons that go inside the main hole go back to the secondary one. Bloons can only go through this once, and MOAB Class Bloons can't be inside them without enough upgrades. Only two holes can be in-screen per time.
 * Level 1: Catches bloon inside and sends them back to the first hole. Free
 * Level 2: Bloons can fall a second time inside. 25 MM
 * Level 3: The hole gets bigger, being able to trap MOABs like 4/x/x Bloonchippers. 75 MM
 * Level 4: The hole gets bigger again, being able to trap BFBs. 125 MM
 * Level 5: The hole generates spikes inside, shredding bloons that go inside it, including MOAB Class Bloons. 150 MM
 * Level 6: The spikes deal more damage to the MOAB Class Bloons. 200 MM