The fastest way to complete the Index in Throw a Coin is to work the tiers in order, starting with the Common section and working up, while running the Mutation Machine on every duplicate you collect. This route hits the 25-entry crossover within a few hours of play, reaches 100% base Index completion in a few days of consistent play, and pushes toward 200 mutation sub-entries within a few weeks. The route is not a single trick — it is a sequence of small optimisations that compound over the course of the run.
The Roblox incremental simulator built by The BEST group yet! has shipped with the Index since launch on May 6, 2026, and the recommended route has been refined by the community over the four months since. The route is independent of which world you are in, because the Index is global, but the route does change slightly depending on whether you have the Mutation Machine unlocked. This page covers both versions.
The Tier-by-Tier Farming Route
The community-recommended Index farming route is to work the tiers in order. The reason is that lower tiers fill quickly because the items are common, and the Index luck bonus you build up while filling the lower tiers carries over to the higher tiers where the items are rare. A player who fills the Common and Uncommon tiers in the first hour has a meaningfully higher Index luck going into the Rare tier than a player who tries to skip ahead to the Rare tier with a partial Index.
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Common and Uncommon tiers fill in a single play session and provide the largest early Index luck bonus.
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Rare tier fills in the first day of consistent play and opens up the Luck Multiplier's meaningful range.
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Epic and Legendary tiers are the mid-game Index targets and are gated by the Fire and Volt coins.
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Mythic and Cosmic tiers are the late-game Index targets and are gated by the Aether and Starlight coins.
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Mutation sub-entries are filled by running the Mutation Machine and require four copies of the same item per entry.
| Step | Tier | Approx. Time | Notes |
|---|---|---|---|
| 1 | Common (Basic Coin) | First 10 minutes | Free, fastest fills |
| 2 | Uncommon (Copper Coin) | First hour | First coin purchase |
| 3 | Rare (Fortune Coin) | First few hours | Duplicates become realistic |
| 4 | Epic (Fire Coin) | First day | Mutation runs become useful |
| 5 | Legendary (Volt Coin) | Mid-game | Push for first Mjolnir |
| 6 | Mythic (Aether Coin) | Mid-game | Mutation fodder becomes valuable |
| 7 | Cosmic onward | Late-game | Slow but steady |
The seven steps above cover the 19 mapped rarity tiers. The remaining five tiers (Primordial, Genesis, Beyond, Omega, Galactic) are late-game goals that require a mature save and a steady cash flow to reach. The wiki does not recommend pushing for those tiers in the first month of play, because the cost in cash and time is not worth the marginal Index luck gain over a 100% base completion.
Why You Should Stay in World 1 for the Early Tiers
A common mistake is to leave World 1 as soon as you can afford the next coin and never return. The reason this is a mistake is that the Index is global, and filling a Common entry in World 2 still requires pulling a Common item from a World 1 fountain. The fastest way to fill the Common tier is to spend time in World 1 with a low-tier coin, even after you have unlocked World 2 and World 3.
The recommended pattern is to alternate between your current world (where the rare items are) and World 1 (where the common items are quick to fill). This is especially valuable during long AFK sessions where the click cost is zero anyway. A 30-minute AFK in World 1 with a Fortune Coin equipped is a guaranteed way to fill several Common and Uncommon entries that you might have skipped in the rush to push to the next coin tier.
The Mutation Strategy
Running the Mutation Machine on every duplicate you collect is the single best way to fill the mutation sub-entries of the Index, and the bonus from filling mutation sub-entries is meaningful because the sub-entries are counted separately from the base entries. A single base item with a full Big → Divine mutation chain contributes six Index entries (one base, five mutations) instead of just one, which is a 6x multiplier on the Index luck you would otherwise earn from that item.
The Mutation Machine was added in Update 3 on July 18, 2026, and it is the only way to fill mutation sub-entries. Before Update 3, mutation sub-entries were effectively unfillable for most players, because the only way to get a mutation was through random chance in the fountain. The Mutation Machine makes the mutation sub-entries a routine part of the Index, rather than a rare lucky break.
| Item | Base Entries | Mutation Entries | Total Possible |
|---|---|---|---|
| Soccer Ball | 1 | 5 (Big → Divine) | 6 |
| Mjolnir | 1 | 5 | 6 |
| Milky Way | 1 | 5 | 6 |
| All 68 base items | 68 | 340 | 408 |
The Mutation Machine is expensive to run, so the recommended strategy is to prioritise the items that are easiest to mutate. Common items are the cheapest to mutate because the value is low, and the mutation sub-entries for Common items fill quickly. Late-game items are the most expensive to mutate, and the mutation sub-entries for late-game items are the slowest to fill. The community rule of thumb is to spend the first 50 mutation runs on Common and Uncommon items, the next 100 runs on Rare and Epic items, and only then start spending runs on Legendary and above.
The Mutation Tier Order
Within the mutation ladder, the recommended tier order is Big first, then Huge, then Rainbow, then Astral, then Divine. The reason is that the lower mutation tiers are much cheaper to produce and the success rate is much higher, so the early mutation sub-entries fill quickly. The later mutation tiers (Astral, Divine) are expensive and rare, so they are filled last.
The Mutation Machine has a roughly 30% success rate on Big mutations with a Common item, and the success rate drops to single digits for Divine mutations with a Legendary item. A player who runs the machine on a Common item for Big mutations can expect to fill several sub-entries per hour, while a player who runs the machine on a Legendary item for Divine mutations can expect to fill one sub-entry per several hours.
The 25-Entry Crossover
The community-observed crossover is around 25 Index entries, where the Index luck bonus becomes large enough to noticeably shift drop rates. The crossover is the most useful milestone in the early game because it is the first point at which the Index investment starts paying off in a way you can see in the drop log. Below the crossover, the bonus is small enough that it is hard to tell the difference from a save with zero entries. Above the crossover, the bonus is one of the dominant luck sources for the save.
| Entries Filled | Approx. Bonus | Drop Distribution Shift |
|---|---|---|
| 0 | 1.0x | Baseline |
| 10 | 1.1x | Barely visible |
| 25 | 1.25x | Noticeable on rare drops |
| 50 | 1.5x | Strong shift |
| 100 | 2.0x | Dominant source |
Hitting the 25-entry crossover takes around three to four hours of focused play, and the route is straightforward: fill the five Common items, then the five Uncommon items, then the six Rare items, then the first four Legendary items. The remaining five entries can come from any tier, and the wiki recommends picking the next tier up because the luck boost is larger.
What Happens After the Crossover
After the crossover, the Index luck bonus grows more slowly, but every additional entry still adds a permanent chunk of luck. The recommended pattern is to keep filling entries as a background activity while you push for the next coin tier. The Index luck bonus and the coin luck bonus are independent, and a save with 50 Index entries and a Fortune Coin is meaningfully stronger than a save with 25 Index entries and a Fortune Coin.
The crossover is also the point at which the Mutation Machine starts being worth the cost. Below the crossover, the cash cost of the Mutation Machine is better spent on the next coin tier. Above the crossover, the cash cost of the Mutation Machine is a worthwhile Index investment because the mutation sub-entries add to the bonus directly.
How to Verify Your Index Bonus Is Growing
There is no in-game counter that shows the current Index luck bonus, but there are two proxies that work well. The first proxy is the Index completion percentage shown in the Index panel. The percentage is the fraction of base entries you have discovered out of 68, and it gives a rough indication of how far you have come. The second proxy is the mutation sub-entry count, which the game does not show directly but can be inferred by clicking into each item in the Index panel.
A more accurate proxy is to keep a rough drop log for a few hundred throws and compare the rarity distribution at different Index levels. The difference is usually visible in the rate at which new rarity bands start appearing for the first time. A save with 50 Index entries that sees its first Mythic drop is a meaningful event, and a save with 100 Index entries that sees its first Cosmic drop is a similar event.
The 100% Base Index Milestone
Reaching 100% base Index completion is a meaningful save file milestone because every base item in the game is now contributing to your luck bonus. After 100% base, the only remaining Index gains come from mutation sub-entries, which require a steady supply of duplicates and a willingness to spend cash on the Mutation Machine. The community-observed effect of reaching 100% base is a meaningful spike in luck that makes the next coin tier noticeably easier to afford.
The 100% base milestone takes around two to three weeks of consistent play to reach on a fresh save. The first 19 tiers are quick to fill, but the late tiers (Quantum, Universal, Omniversal, Absolute, Stellar, Nebular, Beyond, Solar, Zenith, Supernova, Omega, Galactic) take much longer because the items in those tiers are rare and the coin cost to reach those tiers is high. The wiki recommends treating the 100% base milestone as a multi-week project rather than a multi-day project.
Frequently Asked Questions
How long does it take to complete the Index?
The 68 base entries take two to three weeks of consistent play on a fresh save. The 408 full entries (including mutations) take several months of consistent play with the Mutation Machine. The exact time depends on the play schedule and the cash flow into the Mutation Machine.
Should I farm World 1 even after unlocking World 2?
Yes, the Index is global, and the fastest way to fill the Common and Uncommon entries is in World 1 because the drop rates there are the highest. Alternating between your current world and World 1 is the recommended pattern for sustained progress.
Is the Mutation Machine worth the cash cost?
Above the 25-entry crossover, the Mutation Machine is a worthwhile Index investment because every successful mutation run is a permanent Index entry that never decays. Below the crossover, the cash is better spent on the next coin tier to keep the progression smooth.
Do I need the Mutation Machine to complete the base Index?
No, the 68 base entries are fillable without the Mutation Machine because every base entry unlocks on a single drop from the fountain. The Mutation Machine is only needed for the 340 mutation sub-entries that come from successful mutation runs.
What is the most efficient mutation tier to farm?
The Big mutation tier is the most efficient, because the success rate is the highest and the cost is the lowest. The recommended strategy is to fill the Big sub-entries first, then the Huge sub-entries, then the higher tiers in order.