While upgrading individual unit cards is the primary focus of combat, managing your overarching account level is equally critical.
Therefore, understanding exactly how to efficiently generate account experience points (XP) is vital for long-term survival on the ladder.
However, the ratio of gold spent to experience gained changes drastically depending on the level of the upgrade.

If your sole goal is to level up your king tower quickly, upgrading all of your low-level cards evenly is the most cost-effective method.
Many players are stingy, refusing to donate cards because they want to hoard everything for themselves.
You are essentially converting cards you will never use into base hitpoints and currency.
| Experience Source | Efficiency |
|---|---|
| Early Upgrades | Incredibly high efficiency; the absolute best way to gain quick XP if you have a slight gold surplus |
| Endgame Upgrades | Extremely low efficiency; costs 100,000 gold for a tiny XP bump, but mandatory for competitive viability |
In close matches, the winner is often decided by a tower surviving with less than fifty hitpoints.
A higher level tower might kill a goblin in two shots instead of three, preventing thousands of points of chip damage over a match.
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