Donut bumpers, also known as Pillars in the code and referred to as Bollards in the last Time is Kudos show, appear as moving or static obstacles that cause the player to bounce off when they are hit, which can cause the player to fall behind. They can appear in various colours and a stack of donuts. They are present in a lot of Rounds but most of the time their presence does not affect the gameplay heavily.
There are 4 types of donut bumpers:
Moving (Forward and Backward):
These donut bumpers will move and stop and one point, then move back to it's first location. You can see where will it move by looking at the ground, there will be a yellow line, it will move on that line. There can be found at Door Dash, Fall Mountain, Slime Climb etc.
These donut bumpers will rotate in a circle you can see where will it move by looking the yellow line at the floor (it is not visible at Treetop Tumble at the last section). These can be found at Treetop Tumble, Pegwin Pool Party and Lost Temple.
Rotating (With A Ring):
Many donut bumpers can be found in Airtime, all of them being an obstacle to push the player down.
In Door Dash, these obstacles may appear in an alternate version, starting from the second row of doors. In this case, there are multiple bumpers moving on their rails, annoying the players while finding the right door. If a player hits them, or if they hit a player, it will result in an annoying bounce that can distract the player from his goal, allowing other players to pass him up.
An alternate version of Egg Scramble has some bumpers moving in the arena, slowing the players' work.
An alternate version of Egg Siege has moving bumpers near the centre where the eggs are. These bumpers can also appear on the edge as color dividers.
As a variation in the Season 1 (Legacy) mid-season update, moving bumpers were added to Fall Mountain. They annoy the players near the crown (and the victory). They also have a chance to catch balls, though they luckily de-spawn after a while.
In Gate Crash, these obstacles have the same function that they have in Door Dash. They are also present in the standard version of the game. The player has to find the right timing to pass when gates are down, and the bumpers can annoy the player by making him lose his balance.
As of Season 5.fun, Gate Crash may also feature large Donut Bumpers orbited by smaller donut bumpers that are evenly arranged in a circle around it in-between the rows of gates.
In Hit Parade, the bumpers appear in the final section of the standard version. They move slowly but are present in a massive number in the last uphill slime section. They also appear in different colours. Being hit by one may cause a loss of balance and the player may bounce backward, and with the slime road, it could end in disaster. Before the Season 1 (Legacy) mid-season update, the bumpers would not reach all the way toward the edges, allowing the players to simply bypass all risk on the sides.
Moving bumpers are present in an alternate version of Hoarders, to add hitting the balls and making them go in an undesired direction. They also annoy the players who accidentally bump into them, adding chaos to the game.
In Jinxed, coloured bumpers are present to annoy the players in their escape. They move slowly and they are present in a very useless area, so the player should not be really affected by them.
Donuts bumpers are among the many different obstacles that can show up in the rooms of Lost Temple.
Two stationary bumpers can be found following the 360 See Saws in the second section of Party Promenade.
Pegwin Pool Party
On Pegwin Pool Party a small island contains a large donut pillar surrounded by four smaller ones that orbit it.
A set of moving and rotating donut bumpers can be found on the left platforms of the second and fourth sections of Pipe Dream, respectively.
Rock 'N' Roll
The standard version of Rock 'n' Roll has five high team-coloured bumper towers in each section of the first portion of the game, where the teams have to make the ball roll through obstacles faster than the other team to gain precious time. An alternate version of Rock 'n' Roll also has moving bumpers in the last downhill section. The bumpers are needed to randomly hit the ball if they are in the trajectory and make them go backward, giving another team a chance to win. An alternate version of the game presents one extra red bumper for each section before and after the tower section (the last one before falling), to add difficulty to the aim.
Roll Off, Roll On, & Roll Out
Starting in Season 4.5 Dave, The platforms in the first section of Skyline Stumble may feature Bumpers that move sideways on top of them. In a different variant, added in the same update, six Donut Bumpers may show up on the slime slope right after the force-field maze.
In Slime Climb, these obstacles are present in the conveyor belt section, moving on rails and annoying players that try to avoid them. If they hit the obstacles in the direction of the conveyor belt, it will result in an almost certain fall in the underneath section. They are also present in the last slime section before the final pendulums, with the same role.
Speed Circuit features many donut bumpers along most of the path. As usual, they cause players to bounce off of them, possibly knocking them down.
Several static Donut Bumpers are spread around Sweet Thieves. These are colored pink. Furthermore, four moving Donut Bumpers are located on a corridor leading to one of the candy spawn points. These are colored blue.
The Slimescraper has got a lot of bumpers, both static and moving. Some static bumpers are placed in the slimy sections where the players could fall. Moving ones are placed in a lot of places to add difficulty. As of Season 5.fun, the light swingers on Ramp 6 may be replaced by several donut bumpers that move rapidly along the path.
Donut Bumpers are present at several points of the lower section of Track Attack, presenting an extra challenge for players.
Bumper Donuts are arranged in circles throughout Treetop Tumble. One such set is found immediately after the first water section on the lower path, rotating in alternate directions (clockwise and counterclockwise). Following that, two unique "donut wheels" can be found on the upper path, close to the Beams and Expanding Frogs. Finally, a set of spinning donuts can be found around the last Spinning Plate, just before the finish line.