Cruise boosting (CB for short) is an exploit useful in BFBB speedruns. It can be triggered by using Bubble Bowl and Cruise Bubble on the same frame while on a flat surface. A Fast CB can be done by performing one against an object then strafing in a certain direction to capture a faster speed, because the game calculates the bowling speed boost based on your movement into the bowl.
Cruise boosting works because activating the Cruise Bubble doesn't allow the Bubble Bowl state to end properly. This causes the game to continue pushing SpongeBob forward as if he was still in the bubble bowl animation.
Ending a cruise boost may be done through using a Bubble Bowl, taking damage, dying, using a Bus Stop, or warping to another level. All of these actions end bowl state and thus cancels the player's speed.
Falling a distance greater than or the same as bashing from Mrs. Puff's head will store downwards momentum in a cruise boost. This is used to lag clip.
A mechanic similar to cruise boosting may be performed in The SpongeBob Squarepants Movie in the level "Welcome to Planktopolis... Minions." If the player jumps on top of the bungee hook in the first area of the level, uses a Sponge-Bowl, and walks off the bungee hook, SpongeBob will be continuously pushed forward, albeit at a relatively slow speed.
Types of cruise boost
A reverse cruise boost (RCB) is done
with the camera facing sideways and it cancels the bubble animation for the 2nd cruise boost.
It is termed
reverse because originally the trick involved having the player face the camera rather than cruise boosting with SpongeBob facing perpendicular to the camera.
An instant cruise boost (ICB) is performed by doing a CB on the frame before running into collision, while the exact distance away from that collision as your momentum while carry you over the following frame. They can be stacked and get more precise each time.
A displacement cruise boost (DCB) occurs when doing a regular cruise boost and having a bowling ball displace you on the 2nd input, so when the cruise boost is completed Spongebob's speed from being displaced is maintained, and the cruise boost becomes multiple times faster than normal, up to 5x as fast.
A ledge cruise boost (LCB) differs from a normal cruise boost when Spongebob is in the position to fall off a ledge in between the first and second cruise-bubble and bubble-bowl input. This will cause the second and final input to occur as Spongebob is mid-falling, which increases his speed greatly.
Throughout late 2019, many ledge cruise boosts were found in multiple levels, with some being upwards of 42 speed. For reference, a normal cruise boost is 5 speed, or 5 times spongebob's normal walking speed.
This allows ledge cruise boosts to be utilized in more categories and for potential reroutes.
1. At the beginning of JF, on the ledge next to the first platform.
2. Near the JF bungee shown in the attached GIF, the first known LCB.
3. At the top of the slide before Patrick's Dilemma.
4. At the bottom of the slide, next to the box.
5. Inside the JF cave, before the gate you open by spinning two buttons. This one gives Spongebob enough speed to get past the pressure plate gate before it closes.
6. Near the beginning of Downtown. This one gives Spongebob a 42 speed LCB because when he approaches this ledge he gets displaced rapidly due to the unequal geometry of the ledge, causing him to displace more in between the first and second cruise boost. It's barely rta viable, and it allows you to Lag clip through most walls because you go so fast.
7. Next to Larry in Goo Lagoon.
8. Between the first and second step onto the bumper boats.
9. On a piece of sand next to the starting line for Flounder Hill.
10. On a rock in the starting area of Slide 3.
11. On a rock behind the taxi in Kelp Forest.