If this system fails, the game becomes a frustrating, unplayable mess that bleeds players instantly.

While this conspiracy theory is widespread, the reality is much more mundane and focused entirely on mathematical fairness.
Trophy and Rating Systems
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.
Do not expect to win every game.Patience is required.Losing streaks are also self-correcting. Level-Based Matchmaking
The standard Elo system works perfectly for chess because all pieces are equal, but tower rush games feature upgradeable cards.

To combat this, developers have implemented secondary checks that look at the player's King Tower level.
Algorithm CheckImportance LevelElo RatingThe system will always prioritize finding an opponent within a 50-trophy rangeKing Level / Card LevelsThe system tries to match levels, but will abandon this check if the queue takes longer than 10 seconds True Fairness
This is why all true esports tournaments and competitive challenges utilize the 'Tournament Standard' ruleset.

The algorithm is blind; it only respects victory.