The Christmas event in Steal a Brainrot has introduced one of the community’s most interesting and highly anticipated mechanics: the Christmas fusion machine, a device that allows you to sacrifice four brainrots to try to obtain new and secret brainrots exclusive to the event. This mechanic introduces elements of probability, strategy, economy, and smart management of your brainrots, which has led to common questions among players: What should I sacrifice? How much should I risk? How do I get the highest number of secret brainrots from the Christmas machine?

How the Santa Fuse Works

To obtain the secret brainrots from the Christmas event, the system is very simple: You must sacrifice four of your brainrots. Their rarity or type doesn’t matter, but their income and rarity do influence your chances, since their “money per second” performance determines your probability of receiving each of the secret brainrots from the Santa Fuse.

The better the brainrots you sacrifice, the higher your chances of getting one of the more difficult secret brainrots. However, this doesn’t mean you should always sacrifice your best units; in fact, in many cases it’s much smarter to bet the minimum.

Inside the machine there are four Christmas secret brainrots, ordered from least to most difficult to obtain. The first three are relatively accessible, while the fourth requires more complex materials or combinations.

1. Cooki and Milki

2. Chicleteira Noelteira

3. Ho Ho Ho Sahur

4. La Vacca Prese Presente

Types of Players

In Steal a Brainrot, you could say there are three types of players:

1. New players: Those who don’t have many secret brainrots, or the ones they do have are weak secret brainrots that generate less than 1M money per second.

2. Mid-level players: Players who have been in the game for a while and already possess several good secret brainrots that generate more than 5M money per second.

3. High-end players: Those who own a large number of secret brainrots that generate more than 20M money per second.

New Players

For many players especially those who don’t have an extensive collection of secret brainrots the first concern is whether they’ll be able to obtain the event units. The good news is that even with low or mid-level resources, it’s still possible to get three of the four secret brainrots without risking valuable units.

By sacrificing four weak secret brainrots (those that produce less than 1 million per second), the machine gives you chances to obtain the two most basic secret brainrots. Even with these minimal sacrifices, it’s possible to progress through the event if you take advantage of external conditions such as machine luck multipliers or constant brainrot recycling.

Mid-Game and Late-Game Players

If you already have a stronger collection secret brainrots that generate more than 1M–5M per second, or even exceptionally powerful ones—you can significantly increase your chances of getting more advanced brainrots.

For example, by sacrificing four brainrots that exceed one million per second, the machine unlocks the possibility of obtaining the third secret brainrot.

Although this doesn’t guarantee that you’ll get it, it does noticeably increase your success rate. Depending on the level of the brainrots used, the probabilities can rise from 6% up to 18% or more, depending on the situation.

However, this is not mandatory, and risking more does not always mean winning more especially when external factors like x4 luck are active.

The Importance of Brainrot Recycling

Recycling is a fundamental technique for maximizing your attempts without spending valuable resources. It consists of using brainrots you receive repeatedly, leftover brainrots, or ones that simply don’t meet your expectations.

Every time you obtain a brainrot that isn’t the one you're looking for, you can recycle it by putting it back into the machine. This creates a new attempt without affecting your main resources. Through repetition, even players with more “humble” collections can eventually obtain important secret brainrots.

x4 Luck in the Santa Fuse

One of the most important moments to use the machine is during admin abuses, when Sammy activates x4 luck in the Santa Fuse. This boost has a massive impact on the probabilities of obtaining higher-tier secret brainrots, because the machine only offers multiplied luck during these special events.

It’s highly recommended to wait until x4 luck is active, especially if you plan to sacrifice strong brainrots or perform a large number of fusions. Betting the minimum during x4 luck can produce results that would normally require much more expensive sacrifices.

In many cases, even when sacrificing four weak secrets during this event, players have managed to obtain high-tier units such as the Chicleteira Noelteira, one of the most valuable brainrots in the machine.

The Advent Calendar and the Machine Skip

Another key element of the event is the Advent Calendar, which occasionally gives out an extremely useful item: the machine skip.

This item allows you to skip the waiting time for the fusion result and, more importantly, it prevents you from paying the 200 Robux normally required to speed up the process. In this way, each skip represents a completely free attempt.

Although the skip does not increase your probabilities, it does increase the number of attempts you can perform without affecting your wallet or your Robux. The best moment to use them is when Sammy activates x4 luck in the machine.