Knowing exactly which Skill Tree upgrades to buy first in Drain the Lake can save you hours of inefficient gameplay. Since its launch in June 2026, IWTM10GTMPLS's incremental simulator has amassed over 29.9M visits and 152K+ favorites, drawing players into the simple yet addictive loop of retrieving a dropped phone from a massive lake. However, the difference between a 10-hour Abyss run and a 50-hour grind comes down to token allocation. This guide provides a complete priority list with exact spending order, from your very first token to end-game optimization.
Complete Priority List
The core loop of Drain the Lake is straightforward: fill your bucket, drain it for tokens, and upgrade your Skill Tree. Because Fill Speed dictates how quickly you complete this loop, it remains the absolute highest priority until diminishing returns force you to balance Capacity and Token Multiplier. Below is the exact purchase order for your first 15 upgrades.
| Priority | Upgrade | Why | When to Buy |
|---|---|---|---|
| 1 | Fill Speed Lv 1 | Primary bottleneck — faster cycles | Immediately |
| 2 | Fill Speed Lv 2 | Continue stacking speed | Immediately |
| 3 | Bucket Capacity Lv 1 | More water per trip | After FS Lv 2 |
| 4 | Fill Speed Lv 3 | Speed keeps compounding | After Cap Lv 1 |
| 5 | Bucket Capacity Lv 2 | Balance speed and capacity | After FS Lv 3 |
| 6 | Fill Speed Lv 4 | Speed still your best ROI | After Cap Lv 2 |
| 7 | Fill Speed Lv 5 | Continue the speed push | After FS Lv 4 |
| 8 | Token Multiplier Lv 1 | Amplify your established base | After FS Lv 5 |
| 9 | Bucket Capacity Lv 3 | More water for deeper zones | After TM Lv 1 |
| 10 | Token Multiplier Lv 2 | Continue amplifying | After Cap Lv 3 |
| 11 | Fill Speed Lv 6 | Push cycle time down further | After TM Lv 2 |
| 12 | Bucket Capacity Lv 4 | Prep for Cavern depth scaling | After FS Lv 6 |
| 13 | Movement Speed Lv 1 | Walking to drain point takes time | After Cap Lv 4 |
| 14 | Token Multiplier Lv 3 | Maximize Cavern token rates | After Mov Lv 1 |
| 15 | Fill Speed Lv 7 | Maintain the cycle advantage | After TM Lv 3 |
Token Budget Allocation
As you progress past the initial 15 upgrades, strict sequencing becomes less practical due to scaling costs. Instead, allocate your token budget by percentage based on your current game phase. Your phase is determined by the depth checkpoint you are actively draining toward.
| Phase | Target Depth | Fill Speed | Capacity | Token Mult | Character | Depth | Automation |
|---|---|---|---|---|---|---|---|
| Early | Shipwreck | 50% | 25% | 15% | 5% | 0% | 5% |
| Mid | Cavern/Mineshaft | 35% | 20% | 25% | 10% | 5% | 5% |
| Late | Molten/Lost City | 20% | 15% | 30% | 10% | 15% | 10% |
| End | Abyss | 10% | 10% | 20% | 10% | 20% | 30% |
During the Early phase, your sole objective is to cycle water as fast as possible. Depth Unlock receives 0% because the Surface and Shipwreck zones do not require Depth Unlock investments to access. By the Mid phase, Token Multiplier overtakes Fill Speed because you are accessing 2-4x token multipliers naturally at the Mineshaft depth, making each bucket significantly more valuable. In the End phase, Automation takes a massive 30% share, allowing you to generate tokens while offline, which is critical for funding the exorbitant costs of Abyss progression.
The Spend-Immediately Rule
The most important principle in Drain the Lake: never sit on unspent tokens. Every token you hold is a wasted upgrade opportunity. The compound effect of immediate reinvestment means:
- Token spent on Fill Speed → Faster cycles → More tokens next cycle
- Token hoarded → Zero additional income
In an incremental simulator, time is your ultimate enemy. If you hold 500 tokens for an hour to afford a Capacity upgrade, you have lost the tokens those 500 tokens could have generated had they been invested in Fill Speed immediately.
Exception: If you are within 1-2 cycles of affording a high-priority upgrade, it is OK to save briefly. But this should be minutes, not hours. For example, if Token Multiplier Lv 4 costs 1,000 tokens and you have 900, save for the next cycle. If it costs 5,000 and you have 200, spend the 200 on Fill Speed right now.
Upgrade Cost Scaling
Skill Tree upgrades cost progressively more tokens at higher levels, following an exponential curve. Understanding this curve prevents you from wasting tokens on low-impact, high-cost upgrades when cheaper, high-impact alternatives remain available.
| Level Range | Relative Cost | Strategy |
|---|---|---|
| 1-3 | Low | Buy immediately — fast ROI |
| 4-6 | Medium | Buy as soon as affordable — good ROI |
| 7-9 | High | Evaluate against alternatives |
| 10+ | Very High | Only buy when other options are maxed |
Because costs spike sharply past Level 7 in any given Skill Tree family, it is far more efficient to keep your core stats roughly leveled rather than maxing one out early. A player with Level 7 Fill Speed and Level 3 Capacity will progress slower than a player with Level 5 Fill Speed and Level 5 Capacity due to the exponential cost of that final push.
Depth Scaling and Upgrade Synergy
Depth is the primary multiplier in Drain the Lake. Pushing deeper is how you exponentially increase your token income, but deeper water requires better stats to drain efficiently. The depth multiplier applies to the base token value of the water you drain.
| Depth Zone | Token Multiplier | Recommended Fill Speed | Recommended Capacity |
|---|---|---|---|
| Surface | 1x | Lv 1-2 | Lv 1 |
| Shipwreck | 1.5-2x | Lv 3-4 | Lv 2 |
| Cavern | 2-3x | Lv 5-6 | Lv 3-4 |
| Mineshaft | 3-4x | Lv 7-8 | Lv 5-6 |
| Molten | 4-6x | Lv 9-10 | Lv 7-8 |
| Lost City | 6-8x | Lv 11-13 | Lv 9-10 |
| Abyss | 8-12x | Lv 14+ | Lv 11+ |
Notice that Depth Unlock is not heavily prioritized in the budget allocation until the Late and End phases. This is because unlocking a depth zone without the Fill Speed and Capacity to actually drain the water there results in a bottleneck. You will be stuck carrying small amounts of highly valuable water very slowly. Always ensure your Fill Speed and Capacity match the recommended levels for a zone before investing heavily in Depth Unlock to reach it.
Bucket Synergies for Skill Tree Upgrades
Your bucket dictates your playstyle. Since buckets are purchased with Gems (earned from badges and chests) or Diamonds (premium currency), your Skill Tree allocation should adapt to whatever bucket you have equipped.
| Bucket | Cost | Rarity | Key Perk | Skill Tree Synergy |
|---|---|---|---|---|
| Common | Free | Common | None | Standard priority (FS > Cap > TM) |
| Plastic | 200 Gems | Uncommon | +5% Fill Speed | Invest more heavily in Capacity to balance the speed boost |
| Metal | 500 Gems | Uncommon | Improved drain efficiency | Push Token Multiplier; efficiency makes each drain worth more |
| Magnet | 1200 Gems | Rare | Attracts nearby items | Prioritize Movement Speed to cover more ground and collect items |
| Toxic | N/A | Rare | +10% Token, 10% instant drain | Maximize Capacity; instant drain chance scales with bucket size |
| Golden | 2000 Diamonds | Legendary | Best gem farming, increases Tokens | Max Token Multiplier first to compound earnings |
| Ancient | 10 Badges + Group | Legendary | +10% Token, higher-tier gem digs | Balance Token Multiplier and Capacity for long gem grinds |
If you are using the Toxic Bucket, the 10% instant drain chance when full changes the math. A full bucket has a chance to instantly complete the drain animation, meaning larger buckets provide more chances for this proc. Shift your budget to favor Capacity slightly over Fill Speed.
If you are lucky enough to earn an exclusive bucket from the Wheel Spin—such as the Toilet Bucket or the Use the Bucket—check their specific perks. Wheel Spin buckets often have unique mechanics that can drastically alter standard Skill Tree priorities. For instance, if a Wheel Spin bucket grants bonus Movement Speed, you can safely divert tokens from the Character/Movement family into Depth Unlock.
Automation Strategy - When to Invest
The Automation Skill Tree family provides idle token generation while you are offline. It is incredibly tempting for new players to invest here early so they can "passively" progress. Do not do this.
Automation generates tokens based on your active earning rate. If your active earning rate is low because you haven't upgraded Fill Speed, Capacity, and Token Multiplier, your offline generation will be negligible.
Follow these milestones for Automation investment:
- 0-5% Budget until Mineshaft: Your active loop is too weak to justify Automation.
- 5-10% Budget at Molten: Your base multipliers are now high enough that offline generation yields meaningful returns.
- 20-30% Budget at Lost City/Abyss: By this stage, active play becomes highly grind-intensive. Automation helps bridge the gap for the massive Depth Unlock costs.
When you log off, your Automation rate calculates your average tokens per minute and applies a reduced percentage over your offline time. Investing heavily in Automation at the Abyss phase allows you to wake up to millions of tokens, pushing you closer to the Find My Phone badge and the game's ending.
FAQ
What if I already bought the wrong upgrades? There is no reset or refund mechanic in the Skill Tree, but Drain the Lake is forgiving—every upgrade helps, just some more than others. Shift your future spending to the priority order outlined above. Even if you over-leveled Depth Unlock early, the tokens you spent still provide access to higher multipliers. Simply redirect your next 20-30 levels of tokens into Fill Speed and Capacity to balance your build.
Is there a point where I should save tokens instead of spending? Only when saving for a specific high-value upgrade that you will reach within a few cycles. Otherwise, always spend immediately. A common trap is saving for a Level 10 upgrade while ignoring Level 5 upgrades in another family. The Level 5 upgrades will provide immediate, compounding returns, whereas the Level 10 upgrade will sit idle until you finally afford it.
How do buckets change my upgrade priority? Buckets with Fill Speed bonuses (like the Plastic Bucket) let you shift tokens toward Capacity. Buckets with Token bonuses (like the Toxic, Golden, or Ancient Bucket) amplify the value of Token Multiplier upgrades. Always read your bucket's perk and invest in the Skill Tree family that makes that perk more effective. The Magnet Bucket, for example, pulls items toward you, making Movement Speed upgrades far more valuable since you can loot a wider radius.
When should I start investing in Depth Unlock? Wait until your Fill Speed and Capacity are high enough to comfortably drain water at your current depth in under a minute. If it takes you 90 seconds to fill and drain a bucket at the Cavern, you are not ready for the Mineshaft. Push your core stats until your cycle time is efficient, then invest just enough in Depth Unlock to reach the next checkpoint.
Are there any codes to get free tokens or upgrades? As of July 2026, there are no verified codes for Drain the Lake. The developer, IWTM10GTMPLS, is expected to release codes via the official Discord and Roblox group after major updates. Instead of waiting for codes, focus on earning the 30 available badges. Easy badges like First Drop, Plunge, and Shark Bait offer 10 Gems each, contributing to the 830+ total Gems available from badges, which you can use to buy better buckets.
Visit our skill tree guide for family details, or check our beginner guide for the core loop.