You can check the Truegold and Tempered Truegold cost for each building from TG1 to TG10 in one place.
This chart is organized around Town Center, Embassy, Command Center, Infirmary, Barracks, Stable, Range, and War Academy, and the slider lets you quickly check the total cost for each TG stage.
After checking your current TG stage cost, it becomes much easier to plan ahead if you also review the top-up guide, latest gift codes, and cumulative top-up notice.
This is a special material additionally required for building upgrades after TG5. It is a higher-grade material created by refining Truegold one step further.
Truegold is refined one step further in the Royal Foundry, improving its hardness and ductility, and becoming a much more powerful advanced material.
Example: You stay in Tier 1 until your weekly total reaches 20. From the 21st refine, you move into Tier 2.