When the player opens the task, a black screen will appear on the left while nine squares appear on the right. The player must memorize the order of the blue squares appearing on the left screen and then replicate it using the keypad on the right. The player will have to memorize the five patterns. The first pattern to replicate will be a single square, and the second will be two squares, and so on until the maximum of five squares. Each pattern builds on the previous pattern. For example, the second pattern will always start with the blue square from the first pattern. The fifth pattern will be the four blue squares' order in the fourth pattern with the new blue square. The player must wait until the screen on the left finishes displaying the squares before entering the keypad pattern.
If the player enters a pattern incorrectly, the blue squares will flash red and the process restarts, in the same order as before, and the player has another opportunity to memorize the pattern. The player may keep trying until they get it correct.
Green circles above the screen on the left indicate how many patterns have been successfully replicated. The green circles above the keypad on the right indicate the number of squares the player has currently selected for the pattern so far.
The player's progress is saved when leaving the task interface for any reason (such as when an emergency meeting is called or if they are killed by An Impostor). After opening the task panel again, the left screen will display the squares required to press on the keypad again without starting it all over. Crewmates can close the task then open it again if they did not memorize the pattern, as the pattern will play through once more.
- In the game's files, Start Reactor's texture data is referred to as "SimonSays", which is also a common nickname for the task used by fans.
- Start Reactor is present on Polus despite lacking the Reactor location. The task is done in Specimen Room instead.
|The sound played when the sequence is shown on the task.|
|The sound played when the player puts in the wrong sequence.|