Player courses are a common type of upload made for players to get through by running, jumping, and using attributes. Player courses often use torch, fire, or magma as well as other obstacles to present a challenge to the player. Some uploaders made player courses with many "levels" - one upload, one level. Sometimes player courses have some simple plot, for example: escape from jail, kill monster or get back glasses to your grandma (Help your grandma by Abaro).
Player Course History
Before the creation of the player, fighter courses were made instead. Some involved no control of the fighters, but others used drag to control the fighters. Users had to drag the fighter across obstacles, making things like torch ceilings, magma flows, and ice walls. The fighter course boom slowly advanced to incorporate pixel art, complex obstacles, and rushing such as magma flows engulfing the game. As fighter courses expanded, more elements and objects were introduced, such as C-4, magma, and boxes. Commonly, players also had to drag fighters through mazes.
Example upload: drag fighter maze by suns.
The introduction to player led to player courses. Due to the fact that players couldn't fly like dragged fighters, player courses could be much more difficult. Pixel art also became much more interactive, such as torch tubes, ladders, and other such things.
Once attributes were introduced to the game, some player courses became more like puzzles than action challenges. Users had to use their heads to figure out how to pass obstacles, such as C4 walls requiring fire to destroy, or metal walls to be "melted" by virus.
Before create was added, players had to be manually re-spawned. Create enabled the edition of automatic checkpoints.
A box course is type of course in which you have to kick boxes to pass obstacles instead of using attributes. For example: kick box out of a water basin, than kick it into torch to burn it and detonate a C4 wall. In box courses, you have to avoid magma lakes and torch placed in places where your burning box will not detonate the C4.
Example upload: Box Mania by Yonder
Pixel Art Player course
This type of player course is interactive pixel art, rather than platform game. You don't have to use attributes, just walk forward and admire design. Some of these do require some concentration on survival through dangerous obstacles.
Some also concentrate on a special theme, such as an element (Element Stage: Thunder), or zero gravity courses (first made by Ader, then were improved). The use of pixel art is so that the obstacles in the game must be compatible with the conditions of the game.
Tech courses involve sensors, electric traps, falling walls, etc. They rarely use create or wall, but instead the player only has one life and torch or another deadly material (such as lit glass) is used to keep the player on the intended course. In many cases walls of stone will drop to seal the player from certain areas, or keep the player from stopping an event.
The uploader Kerli has many good examples of tech courses, and here is one:
Glass courses are usually a race between the player and lit glass. The player must escape the glass before the glass (usually) ignites an explosive