Use this skill when working with game balancing - economy design, difficulty curves, progression systems, reward schedules, playtesting analysis, or tuning game parameters. Triggers on any game design task involving resource sinks and faucets, XP curves, loot tables, difficulty scaling, player retention mechanics, or interpreting playtest data to adjust game feel.
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Use this skill when working with game balancing - economy design, difficulty curves, progression systems, reward schedules, playtesting analysis, or tuning game parameters. Triggers on any game design task involving resource sinks and faucets, XP curves, loot tables, difficulty scaling, player retention mechanics, or interpreting playtest data to adjust game feel.
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Game Balancing
Game balancing is the discipline of tuning numbers, curves, and systems so that a
game feels fair, engaging, and rewarding across its entire play arc. It spans
economy design (ensuring resources flow without inflation or deflation), difficulty
curves (matching challenge to player skill growth), progression systems (giving
players meaningful choices and a sense of advancement), and playtesting (using real
player data to validate or invalidate design assumptions). A well-balanced game
keeps players in flow state - challenged but never frustrated, rewarded but never
bored.
When to use this skill
Trigger this skill when the user:
Needs to design or tune an in-game economy (currencies, sinks, faucets, exchange rates)
Wants to create or adjust a difficulty curve for levels, enemies, or encounters
Is building a progression system (XP, skill trees, unlocks, prestige loops)
Needs to design loot tables, drop rates, or reward schedules
Wants to analyze playtest data to find balance problems
Is tuning player power curves against content difficulty
Needs to model inflation, deflation, or resource equilibrium over time
Wants to design or evaluate a monetization-adjacent economy (free-to-play, gacha rates)
Do NOT trigger this skill for:
General game programming or engine-specific questions (use engine-specific skills)
Narrative design, level layout, or art direction unrelated to balance numbers
Key principles
Every faucet needs a sink - For any resource entering the economy, there must
be a corresponding drain. Without sinks, inflation is inevitable. Map every source
of currency/items to at least one consumption mechanism. Audit the ratio regularly.
Balance for the median, gate for the tail - Tune core difficulty for the
50th-percentile player. Use optional challenges (hard modes, bonus bosses, ranked
ladders) to serve the top 10% and accessibility options to serve the bottom 10%.
Never let outlier players distort the core experience.
Progression must feel earned, not given - The value of a reward is proportional
to the perceived effort required. If players get powerful items too easily, nothing
feels special. If progress is too slow, players churn. Target a "just right" cadence
where each session ends with a meaningful gain.
Playtest data beats intuition - Designer instinct is a starting point, not a
conclusion. Every balance hypothesis must be validated against real player behavior.
Track completion rates, time-to-complete, resource stockpiles, and churn points.
Let the data tell you where the pain is.
Small changes, measured impact - Never change more than one system at a time.
Adjust parameters by 10-20% increments, measure, then adjust again. Large sweeping
changes make it impossible to attribute cause and effect.
Core concepts
The Economy Loop
A game economy is a closed (or semi-closed) system of faucets (sources of
resources), stocks (player inventories/wallets), and sinks (consumption
points). Healthy economies maintain equilibrium where the average player's stock
grows slowly over time without runaway inflation. Model this as a flow diagram
before implementing any numbers.
Difficulty Curves
Difficulty is the relationship between player power and content challenge over time.
The most common models are: linear (steady increase), logarithmic (steep
early, flattening later - good for onboarding), exponential (gentle start,
steep endgame - good for hardcore), and sawtooth (periodic spikes followed by
relief - good for tension pacing). Choose based on your target audience and genre.
Progression Systems
Progression gives players a sense of growth. The key entities are: XP/level
curves (how much effort per level), unlock gates (what content opens when),
power curves (how stats scale with level), and prestige/reset loops (trading
progress for permanent bonuses). The XP curve formula xp_for_level(n) = base * n^exponent is the foundation - exponent values between 1.5 and 2.5 are typical.
Playtesting Metrics
The core metrics for balance validation are: completion rate (% of players
finishing a level/quest), time-to-complete (median session/level duration),
resource velocity (earn rate vs spend rate over time), churn points (where
players quit), and Gini coefficient (wealth distribution inequality among
players in multiplayer economies).
Common tasks
Design an economy with sinks and faucets
Map every resource flow in the game. For each currency or item type, list all
sources (quest rewards, drops, purchases, crafting) and all drains (shops, upgrades,
consumables, repair costs, taxes). Calculate the net flow per hour of play.
Framework - Economy audit table:
Resource
Faucets (per hour)
Sinks (per hour)
Net flow
Health
Gold
Quests: 500, Drops: 200, Sales: 100
Shop: 400, Repairs: 150, Tax: 50
+200/hr
Mild inflation
Gems (premium)
Daily login: 5, Achievements: 2
Gacha: 10, Cosmetics: 5
-8/hr
Deflationary - needs more faucets
Target net flow should be slightly positive (players feel progress) but controlled
by periodic large sinks (major upgrades, prestige resets).
Gotcha: Multiplayer economies need a global sink (auction house tax, item
degradation) or veteran players will hoard and crash the market.
Build an XP/level curve
Define the effort required per level using an exponential formula. The two key
parameters are the base XP and the scaling exponent.
Gotcha: Always validate the curve at level 1, midpoint, and cap. If the last
10% of levels take more than 40% of total playtime, most players will never
see endgame content.
Design a difficulty curve
Choose a curve shape, then map player power and enemy/content difficulty as two
separate curves. The gap between them is the "challenge delta."
Sawtooth pattern (recommended for most games):
Each world/chapter starts slightly below player power (breathing room)
Ramps up to match player power by mid-chapter
Boss/climax exceeds player power by 10-20% (challenge spike)
Next chapter resets to below (reward feeling from new area)
Checklist for difficulty tuning:
Can a median player complete the tutorial in under 5 minutes?
Is the first death/failure no earlier than 10-15 minutes in?
Does each major section have at least one "relief" moment?
Is the final boss beatable without grinding (with skill)?
Are optional hard challenges clearly marked as optional?
Design loot tables and drop rates
Use weighted random selection with rarity tiers. Standard rarity distribution:
Tier
Drop weight
Typical %
Power relative to Common
Common
60
60%
1.0x
Uncommon
25
25%
1.3x
Rare
10
10%
1.7x
Epic
4
4%
2.2x
Legendary
1
1%
3.0x
Pity system: Guarantee a rare-or-better drop every N pulls to prevent
frustration streaks. Typical pity thresholds: 10 pulls for Rare, 50 for Epic,
90 for Legendary.
Gotcha: Without a pity system, ~37% of players will go 100 pulls without a
1% drop. That feels terrible. Always implement pity mechanics.
Analyze playtest data for balance issues
When reviewing playtest results, look for these red flags:
Completion rate signals:
Below 70% completion on a required level = too hard, tune down
Above 95% completion with zero deaths = too easy, tune up
Sharp drop-off at a specific point = difficulty spike or unclear objective
Economy signals:
Average player stockpile growing faster than content releases = inflation
Players unable to afford core upgrades at the expected level = too stingy
Top 10% of players holding 80%+ of wealth = need progressive sinks
Session length signals:
Sessions under 5 minutes = poor hook, first 3 minutes need work
Sessions over 3 hours with no break points = add natural stopping points
For every new reward source, add a corresponding consumption mechanism
Linear XP curves
Every level feels the same, no sense of acceleration or accomplishment
Use exponential curves (1.5-2.5 exponent) so early levels are fast and later ones feel earned
Nerfing popular strategies
Players feel punished for finding optimal play; generates resentment
Buff underused alternatives instead - bring the floor up, don't lower the ceiling
Changing multiple systems at once
Impossible to know which change caused which effect
Change one variable at a time, measure for at least one full play-cycle, then adjust the next
No pity system on random drops
~37% of players hit frustration streaks on 1% drops within 100 attempts
Implement guaranteed minimum drops after N failed attempts
Flat difficulty throughout
Players either get bored (too easy) or frustrated (too hard) with no variation
Use sawtooth curves with tension peaks and relief valleys
Gotchas
Balancing the median player silently destroys your hardest content - If you tune difficulty for the 50th percentile, the top 10% of players will find late content trivial within a week of release. Segment playtesting explicitly - run sessions with expert players separately from casual ones, and tune different content tiers to different targets.
Pity systems need a persistent counter, not a session counter - If the pity counter resets on app restart or session end, players who hit the pity threshold just before quitting restart from zero next session. The pity counter must persist to permanent storage and survive all session boundaries.
XP curve validation is useless without a realistic earn rate - The formula looks right on paper, but if you model 200 XP/hr and real players average 80 XP/hr, the curve is 2.5x harder than designed. Always validate the curve against measured in-game earn rates from playtests, not theoretical maximums.
Buffing alternatives that nobody uses doesn't fix the problem - If one strategy is dominant because it synergizes with a core mechanic, buffing weak alternatives doesn't break the dominance - it just makes the game slightly more powerful overall. First identify WHY the dominant strategy is dominant (usually a core mechanic interaction), then address the root cause.
Free-to-play "ethical" balance breaks if premium items stack - Premium items that are individually 2x free alternatives become 8x when players stack three of them. Always model stacking scenarios during balance review, not just individual item comparisons.
References
For detailed content on specific sub-domains, read the relevant file
from the references/ folder:
references/economy-design.md - Deep dive on sink/faucet modeling, inflation
prevention, and multiplayer market dynamics
references/progression-formulas.md - XP curve formulas, power scaling math,
prestige loop design, and worked numerical examples
references/playtesting-guide.md - How to run playtests, what metrics to track,
statistical significance for small samples, and interpreting results
Only load a references file if the current task requires it - they are
long and will consume context.
Companion check
On first activation of this skill in a conversation: check which companion skills are installed by running ls ~/.claude/skills/ ~/.agent/skills/ ~/.agents/skills/ .claude/skills/ .agent/skills/ .agents/skills/ 2>/dev/null. Compare the results against the recommended_skills field in this file's frontmatter. For any that are missing, mention them once and offer to install:
