Throw a Coin How to Mutate Items: Step by Step 2026

Mutating items in Throw a Coin is done at a single map feature — the Mutation Machine — added in Update 3 on July 18, 2026. The machine sits at one end of the main map, anchored to the Worlds portal, and it accepts two items of the same base type in exchange for one rolled output. This page walks the full flow from opening your inventory to collecting the result, and it spells out the rules that decide whether a roll is a clean win or an expensive mistake on the input stockpile.

If you have never used the Mutation Machine before, the walkthrough below is the script you should follow on your first visit. The steps are the same every time, the input rules are the same every time, and the cost of a failed roll is the same every time. Read the page once, then run the walkthrough on a pair of starter items before you point the machine at anything you actually care about in the rest of your inventory.

Before You Walk to the Machine

The mutation system punishes improvisation, and the cheapest way to avoid improvisation is to set up your inventory before you walk to the corner of the map where the Worlds portal sits. The setup is the same whether this is your first roll or your hundredth at the machine corner of the map.

Three things need to be in your inventory before you start. First, two items of the same base type — the machine will not register a "Ready" state until the types match exactly on the nameplate above the central merge slot. Second, at least one unmutated copy of the same base type left in your inventory as a reserve against a failed roll. Third, a clear sense of which result tier you are actually rolling for, because the discipline of the roll depends on knowing the target tier in advance.

Pick the Inputs

The Mutation Machine consumes both inputs on every roll, and a failed roll still consumes them. The first rule of mutation is therefore to pick inputs you are willing to lose twice — once to the roll, and once to the opportunity cost of not selling them at the magic fountain for raw cash. The wiki keeps this rule repeated on every mutation page, because it is the rule that decides whether a long grind is a long grind or a long failure.

• Match the base type exactly. Two items of the same rarity but different base names will not register as a Ready pair on the machine nameplate.

• Match the rarity band if you can. Same-type items of the same rarity are the cleanest inputs, and they remove any confusion about which band the roll is being scored against.

• Avoid feeding the machine your only good copy. If you only have one copy, the roll cost is the whole copy, and a failure leaves you with nothing to rebuild from.

• Avoid feeding the machine your last sellable item. If the roll fails, you have no fallback inventory to keep your cash flow going at the magic fountain for the rest of the session.

Pick the Result Tier

The Mutation Machine can roll any of the five mutation tiers, from Big at the bottom of the bar to Divine at the top. The result tier is decided by an in-game roll, and the developer has not published a per-tier drop rate. The practical implication is that the result tier is something you accept in advance, not something you pick from a menu on the machine, and the input discipline should reflect the tier you are actually targeting.

• Big is the floor — most rolls of starter inputs will produce a Big item or a plain item, and Big is the baseline of the mutation ladder.

• Huge is the first real upgrade, and a common outcome for mid-tier inputs that are being rolled at the machine in normal sessions.

• Rainbow is the first jackpot, and a rare outcome for any input tier fed into the machine over a session of dozens of rolls.

• Astral is the pre-endgame mutation, and a rare outcome reserved for late-game inputs that justify the input cost of a long grind.

• Divine is the top tier, and the rarest practical outcome of any roll at the machine corner of the map.

The Mutation Walkthrough — Step by Step

The flow at the machine is the same flow every time. There are no shortcuts, no skips, and no hidden inputs that the wiki has not yet documented. The walkthrough below covers a single use of the machine from a cold start to a collected output, and the same twelve steps apply whether this is your first roll or your hundredth at the machine over the course of a long mutation grind.

1. Walk to the corner of the map where the Worlds portal sits.

2. Face the Mutation Machine to the left of the portal frame.

3. Open your inventory and select the first item you want to merge.

4. Click the left input pad to place the first item.

5. Open your inventory again and select the second item.

6. Click the right input pad to place the second item.

7. Read the machine nameplate to confirm the type match is valid.

8. Click the central merge slot to trigger the roll.

9. Wait for the result tray to flash.

10. Read the result tier on the mutation bar above the slot.

11. Click the output item on the tray to collect it.

12. The machine resets and the input pads light up again for the next roll.

The walkthrough above is twelve steps, and the first six are setup. Step 7 is the gate — if the nameplate does not show "Ready," the roll will not fire, and you need to back out and pick a different pair of inputs from your inventory. Step 8 is the commitment — once you click the central merge slot, both inputs are consumed, and the result is final. Steps 9 and 10 are the readout, and step 11 is the collection. Step 12 is the reset, and it is also the cue to start the next roll if you have a session budget left for the day.

What Each Step Looks Like in Game

The visual feedback at the machine is the same on every roll, and the wiki recommends paying attention to it. The left input pad glows when the first item is placed. The right input pad glows when the second item is placed. The machine nameplate shows the base type of the placed items once both pads are lit, and it switches to "Ready" when the types match. The central merge slot flashes when the roll fires, and the result tray holds the output for a few seconds before it despawns into your inventory.

The Three Worlds and the Machine

The Mutation Machine is reachable from any of the three worlds, because the machine is anchored to the Worlds portal that all three worlds share. The table below maps each world to the input band that the world's loot typically produces, and the mutation tier that the input band typically targets at the machine corner of the map.

The Roll Result Ladder

The Mutation Machine can produce one of six outcomes on a single roll, and the readout on the mutation bar is the truth about which outcome the roll produced. The table below is the source of truth for the six possible outcomes of a single roll at the machine, and the practical effect of each outcome on your inventory and the input supply.

What Happens to Failed Rolls

A failed roll is a roll where the output item comes out with no mutation tier at all. The two inputs are still consumed, so a failed roll is a real cost. The output item is still in your inventory, and you can re-feed it into the machine on a future roll, but you have not gained a mutation. This is the single most important mechanic to internalise before you start a long mutation grind, because every long grind is built on top of failed rolls and the cost they represent in input supply.

How to Tell If a Roll Failed

The readout on the mutation bar is the truth. If the bar shows no segment lit up after a roll, the output is a plain item with no mutation. If the bar shows the Big segment lit up, the output is a Big item. If the bar shows the Divine segment lit up, the output is a Divine item, and your grind has paid off the input cost of the long project with a top-tier roll.

• No segment lit — failed roll, plain item, both inputs consumed and not refunded.

• Big segment lit — Big mutation, both inputs consumed, modest markup on the result.

• Huge segment lit — Huge mutation, both inputs consumed, real upgrade on the result.

• Rainbow segment lit — Rainbow mutation, both inputs consumed, first jackpot of the session.

• Astral segment lit — Astral mutation, both inputs consumed, pre-endgame mutation result.

• Divine segment lit — Divine mutation, both inputs consumed, top-tier mutation result.

Rules That Apply to Every Roll

There are five rules that govern the mutation system, and they apply to every roll, regardless of the result tier. The wiki keeps them listed together because they are the rules that decide whether a mutation grind is sustainable over weeks and months of sessions at the machine corner of the main map.

• The machine only accepts two items of the same base type. Two items of the same rarity but different base names will not register, and the nameplate will not show "Ready" until the types match exactly.

• The machine consumes both inputs on every roll. Failed rolls still cost the inputs, and the input cost is the same whether the roll succeeded or failed at the mutation bar readout.

• The result is a single item with at most one mutation tier. Re-feeding an already-mutated item produces another single-mutation result, not a stacked mutation of two or more tiers on the same output.

• The output item is yours to keep. A failed roll still produces an item, and that item is yours to re-feed or sell at the magic fountain for cash in a later session.

• The machine has no batch mode. You cannot feed it three or more items at once, and you cannot chain rolls together from a single confirmation click on the central merge slot.

Discipline Tips for First-Time Users

The Mutation Machine is one of the few systems in Throw a Coin where a small amount of discipline saves a huge amount of inventory. The tips below are the rules the rest of the mutation guides on this wiki keep repeating, and they are the rules you should follow on your first few visits to the machine to keep the input stockpile healthy.

• Start with your lowest-value duplicate items. Your first rolls should be on items you are comfortable losing in a failed roll, and the wiki never publishes a hard cost figure for the machine.

• Keep at least one unmutated copy of every important item. If you mutate your only good copy and the roll fails, you are out of luck and the copy is gone for the rest of the session.

• Treat the machine as a long-term system. A single Divine roll is a multi-session grind, not a five-minute detour, and the input stockpile is what makes the long-term grind possible over weeks of sessions.

• Come back to the Worlds portal between rolls. Since the machine is anchored to the portal, you can run a world-specific farming loop and dump outputs into the machine on the same trip without losing the rhythm of the session.

• Log every roll. A long grind without a roll log is a long grind without feedback, and the wiki's mutation ROI guide covers the spreadsheet side of that tracking for the long game.

Frequently Asked Questions

How do you mutate items in Throw a Coin?

You mutate items at the Mutation Machine, which is at one end of the main map, anchored to the left of the Worlds portal frame. Place two items of the same base type on the input pads, click the central merge slot, and collect the output from the result tray above the mutation bar.

What does the Mutation Machine accept as inputs?

The Mutation Machine only accepts two items of the same base type, and two items of the same rarity but different base names will not register. The machine nameplate will not show "Ready" until the types match exactly and both input pads are lit at the same time on the machine.

What happens if the roll fails on the Mutation Machine?

A failed roll still consumes both inputs and produces the same base item with no mutation tier attached, and the output is yours to keep in your inventory. You can re-feed that plain output into the machine on a later roll, but you have lost the two original inputs in the process of the failed attempt.

Can I get the Divine mutation from the Mutation Machine in Throw a Coin?

Yes, Divine is the top tier on the machine's mutation bar and the only tier the wiki tags with the Endgame band. It is the rarest practical outcome of any roll, and the rest of the mutation guides on this wiki are built around the long-term grind required to see one Divine.

How many inputs does a single Mutation Machine roll cost?

Every roll costs exactly two inputs, and every roll produces exactly one output, whether the roll succeeded or failed at the mutation bar readout. There is no batch mode at the machine, and the inputs are consumed every time you confirm a merge on the central merge slot.