Game Economy Design: Faucets & Sinks, Drop Rates, Progression Curves & Monetisation

What you'll build

What you will be able to do

Each lab ends with a concrete result that you build yourself and the checker confirms, cell by cell.

• Calculate the gold each source creates or removes per player per day, the faucet and sink totals, the sink-to-faucet ratio and how a player's gold pile grows in a month.
• Build two XP-per-level curves, the cumulative XP of the exponential one, find a player's level from total XP and chart both curves.
• Calculate expected attempts, the chance of at least one drop in N attempts, the attempts needed for a 90 % chance and the effect of a pity timer.
• Calculate the chance that the next pull is new, the expected pulls for each new hero, the expected pulls to complete a 12-hero banner and what that would cost in real money.
• Roll up the gold cost of a three-level crafting tree, count the raw ore inside the final item and the gold the fees remove from the economy.
• Calculate total gems and gems per USD for each pack, the value compared with the smallest pack, the best-value pack and the gem value of a starter bundle.
• Calculate each segment's share of revenue, the ARPPU of the paying segments, the game's ARPDAU and chart the revenue mix.
• Compare XP per minute across activities, calculate a typical player's daily XP and days to level 20, and scale the rewards so the target time is met.