At A Glance
- Focus upgrades on mining first, only investing in speed/cargo when necessary to prevent chokepoints.
- Unlock new planets until mining levels reach a tipping point (around level 12) and payback times degrade.
- Use payback time as your guiding metric; reset your galaxy when further progress becomes inefficient.
Why the Upgrade vs New Planet Decision Matters
Every investment in Idle Planet Miner must be measured against its true return. Upgrading a planet increases its production, while unlocking a new planet adds a fresh income stream—often with access to higher-value ores. But as upgrade costs scale and returns diminish, the balance between upgrading and expanding shifts. The optimal strategy adapts to your stage in the game, using payback time and bottleneck awareness to guide choices.
Strategy Set 1: Core Upgrade Principles
1. Mining is the bottleneck—upgrade it first
Planetary systems have three upgrade tracks: mining rate, ship speed, and cargo capacity. Mining is almost always the limiting factor. Upgrading speed or cargo yields useful benefits, but they only matter when shipments lag behind production. It’s common to maintain a rough relationship where mining level ≈ (speed level + cargo level).
If you upgrade all three equally, you can end up spending nearly three times more than needed.
2. Upgrade costs scale and payback time lengthens
Each planetary upgrade raises cost by about 30%, while income increases around 10%. As a consequence, payback times normally increase by ~20% with each mining upgrade. Over time, the return on further upgrades slows significantly.
3. Always compare payback time
For any upgrade or planet unlock, compute:
Payback Time = Upgrade Cost ÷ (Additional Income per second)
Choose the option with the shorter payback time. If unlocking a new planet yields a faster return than upgrading your current ones, expand. If an upgrade pays back faster, invest. As costs climb, many upgrades will lose this advantage.
Strategy Set 2: When to Unlock New Planets
4. Unlock planets until your best is ~Mining Level 12
One guideline is to keep unlocking new planets until your top planet hits about level 12, with other planets lagging by no more than ~2 mining levels. At that point, further expansion yields diminishing returns compared to upgrades.
5. Unlock cost vs upgrade cost relation
A planet’s unlock cost is typically ~20× its first-upgrade price. Freshly unlocked planets aren’t very productive until they’ve been upgraded several times. Only after investing ~10 levels or more should you reassess whether its payback becomes competitive.
6. Sometimes outer planets or special ores are worth the extra cost
In certain cases, you may find that investing more into an outer planet yields better payback because of ore pricing advantages or resource star bonuses. If the calculated payback for a farther planet is competitive, it may be worthwhile to push it ahead of closer ones.
Strategy Set 3: Recognizing Diminishing Returns & Resets
7. Watch for drastically increasing payback times
When payback times grow too long—especially for mining upgrades—it’s a sign the current run is becoming inefficient. At this stage, further resource investment yields slow returns.
8. Sell (reset) your galaxy at the right time
Resetting your galaxy converts its value into credits and permanent bonuses that make your next run stronger. It’s often optimal to reset before the upgrade cost curve becomes punishingly steep.
9. Multiple shorter runs can outperform one marathon run
Instead of trying to push one immense galaxy, doing repeated runs (resetting earlier) can compound permanent gains faster. Many players find this accelerates long-term progression.
Strategy Set 4: Supporting Mechanics & Secondary Systems
10. Leverage room upgrades (mothership rooms)
Rooms on your mothership (Engineering, Laboratory, Dorm, etc.) provide multiplicative effects on mining, smelting, crafting, and upgrade costs. Focus first on rooms that aid mining or reduce upgrade cost. Over time, expanding rooms and unlocking new ones becomes essential.
11. Use auto-sell strategically
Auto-sell allows automatic conversion of surplus ore to cash. Early in a run, use it aggressively (e.g. for low-value ores) to keep resources flowing. Later, turn it off or fine-tune percentages so you retain what’s needed for smelting and crafting.
12. Prioritize colonization (and its benefits) carefully
Colonization gives benefits equivalent to a few mining upgrades (e.g. 2.5 taps), so it’s only worth doing when its cost is less than or comparable to multiple upgrades. Always select mining as the colonization benefit (rather than speed or cargo), since shipping is already efficient for inner planets at that stage.
Strategy Set 5: Managers, Stars & Boosts
13. Use managers to balance backlog and production
Assign mining managers to planets to push production. To clear backlogs, swap in speed or cargo managers temporarily. Higher-level managers sometimes carry secondary bonuses that boost all mining, speed, or crafting when deployed.
14. Resource stars tilt the balance
Resource stars increase ore sale price (e.g. +20% per star). When an ore you produce has extra stars, it shortens payback times and can justify extra upgrades or prioritizing planets producing that ore.
15. Time your boosts wisely
Planetary or production boosts (10× multipliers) should be used when upgrades can still pay back quickly—if payback is ≤ ~50 minutes, pack in extra upgrades during the boost. Combine boosts (planet + time warp) when possible for amplified effect.
Implementation Advice & Common Mistakes
- Maintain a spreadsheet or tool to approximate payback times across upgrade and planet options.
- Monitor ore buildup carefully. If a planet is stockpiling too much, it signals a speed or cargo bottleneck.
- Don’t overinvest in rooms or colonization too early. Their costs escalate, and returns may lag behind planet upgrades.
- Adjust auto-sell settings depending on your crafting pipeline—turn it off or reduce it when idle mode is active.
- Focus research and tech tree when planets are stabilized (e.g. all reach mining ~12 before branching into new tech).
- Watch for asteroid income and debris scanner mechanics later in the game—sometimes they can surpass ore income if your planets lag too much.
Final Thoughts
In Idle Planet Miner, the line between upgrading and unlocking new planets crosses and recrosses as you advance. Early on, expansion to access new ores is powerful. Later, upgrades—especially in mining—become more efficient. Use payback time as your north star, and shift your strategy when returns degrade. Integrate support systems—rooms, managers, resource stars—and reset your galaxy when it makes sense. By dynamically balancing upgrades and expansion, you’ll push your mining empire further and faster with every run.