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The matchmaking algorithm is the unsung hero that determines exactly who you will face every time you press the 'Battle' button.

While this conspiracy theory is widespread, the reality is much more mundane and focused entirely on mathematical fairness.
The Elo System Adapted
The algorithm's primary goal is to match you against someone with the exact same—or very similar—trophy count.

When you go on a massive winning streak, your trophy count inflates, and the algorithm begins matching you against significantly better players.
The algorithm does not care what deck you are playing.If you face a hard counter, it is pure statistical variance.AI opponents ensure instant queue times for beginners. The Problem of Card Levels
The standard Elo system works perfectly for chess because all pieces are equal, but tower rush games feature upgradeable cards.

The system will try its best to match you with someone who has the same trophies AND a similar tower level.
Conspiracy TheoryHow it Actually WorksForced Loss StreaksThe algorithm does not force losses; you are simply playing tilted against harder opponents because your MMR is inflatedAnti-Strategy CodeDevelopers have confirmed repeatedly that the algorithm does not read the contents of your deck when finding an opponent True Fairness
By artificially capping all card levels to a specific number, the algorithm can rely purely on the Elo rating.

The algorithm is blind; it only respects victory.