While upgrading individual unit cards is the primary focus of combat, managing your overarching account level is equally critical.

Many players inadvertently stall their base progression by hoarding resources or ignoring the social systems of the game.
Leveling Up the Deck
Every time you spend gold to increase a card's level, you are rewarded with a burst of experience points.

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.
Upgrade your main deck first, always.It is the most efficient conversion rate.Balance is required. The Guild Economy
This is a massive progression error; donating provides both gold and crucial experience points instantly.

This is why joining an active clan of fifty people who constantly request cards is absolutely mandatory for free-to-play users.
Experience SourceEfficiencyStarter LevelingIncredibly high efficiency; the absolute best way to gain quick XP if you have a slight gold surplusMaxing OutExtremely low efficiency; costs 100,000 gold for a tiny XP bump, but mandatory for competitive viability The Impact of King Levels
In close matches, the winner is often decided by a tower surviving with less than fifty hitpoints.

Never neglect your base progression; it is the silent protector that wins games.

For more info on tower rush look at our own page.