For Yet Another Zombie Survivors how to unlock all characters, start with the confirmed facts: SWAT, Tank, and Engineer are initially available, Huntress and Ghost have consistent older-source conditions, and Ranger officially unlocks at Survival Level 175. Medic has conflicting historical Health Pack totals, while the collected Pyro and Mechanic conditions come from non-official 1.0 summaries. Check the live character-selection progress counter before acting on any entry marked 待确认：.
Characters available at the start
SWAT, Tank, and Engineer are listed as initially available across the collected sources. They require no hidden input or invented redemption code, so a new player can use them to begin ordinary progression. Their different roles also give a practical base for pursuing the timed, cumulative, and collection-based unlocks that follow.
Tank or SWAT is a straightforward candidate for survival-focused attempts because the collected guides treat them as dependable early leaders. Engineer remains available when an area-control approach better fits the player. This is a recommended progression method, not a separate unlock condition for any of the three starting Survivors.
How to unlock Huntress
Huntress is consistently reported by the older Steam guide and another historical guide as unlocking after surviving 15 minutes in one run. The agreement makes this condition more stable than entries supported only by a recent non-official table. Confirm that the current version's character-selection screen shows the same requirement before treating the run as complete.
Use Tank or SWAT to develop one main weapon and keep moving until the timer reaches the stated point. Do not spread the early upgrades so widely that no weapon can hold ordinary waves, because the objective is survival rather than testing every character route at once. If the in-game progress text differs from the historical condition, the current client takes priority.
How to unlock Ghost
Ghost is consistently reported as requiring 100 cumulative Boss or elite kills. The older material says the total carries across runs rather than requiring all kills in one attempt. That makes normal progression the safest approach because repeated runs advance the counter without a special code or one-run challenge.
Historical sources also treated some stronger enemies with visible health bars as counting toward the total. 待确认：version 1.0 counting should be verified against the live progress bar before claiming every elite category contributes. Record the counter before and after a run if you need to test which enemies are eligible.
How to unlock Medic
The collected sources agree that Medic progression involves collecting Health Packs, but they disagree on the required total. Older material reports 200, while a newer non-official source reports 100. 待确认：use the exact total displayed by the version 1.0 character-selection screen and do not publish either historical number as current fact without that check.
Health Packs can only be picked up when the squad is not already at full health. Search results also suggest that healing supplied by upgrades may not count as a physical Health Pack pickup. 待确认：take controlled damage, collect the actual pack, and compare the in-game progress counter to verify what version 1.0 records.
How to unlock Pyro
A non-official 1.0 source reports that Pyro unlocks after dealing 1,000,000 elemental damage. The collected research does not include an official announcement confirming that value. 待确认：read the current Pyro progress condition in the game before planning around the number.
If the client confirms an elemental-damage requirement, an elemental team is the logical progression direction described by the research. Keep the test tied to the current counter instead of assuming every damage tag qualifies. Do not add a faster method, exact run count, or guaranteed team because the collected sources do not establish one.
How to unlock Mechanic
A non-official complete table reports that Mechanic requires 4,000 ability triggers. This condition and value are not confirmed by the official 1.0 announcement in the collected material. 待确认：the live character-selection screen must supply the current requirement before it is presented as fact.
If that screen confirms an ability-trigger objective, use a team and upgrades that create frequent ability activations. Keep weapon attacks separate from ability triggers unless the counter demonstrates that both qualify. The research supports the direction of a low-cooldown ability team, not a claim about an exact fastest build.
How to unlock Ranger
Ranger unlocks by reaching Survival Level 175 according to the official version 1.0 release announcement. This is the strongest-sourced unlock condition among the post-release additions and does not require a hidden map interaction. Continue overall progression until the account reaches the official level threshold.
Ranger is also identified officially as the ninth Survivor. Her addition means older guides with six or eight characters cannot represent the complete version 1.0 roster. Use the official condition rather than a search summary that may have copied an earlier character list.
Recommended unlock order
First, use Tank or SWAT to survive 15 minutes and test the Huntress condition shown in the current client. Continue ordinary play to accumulate Ghost progress, then deliberately take a manageable amount of damage before collecting Health Packs for Medic. After those goals, use confirmed in-game counters to direct elemental or frequent-ability teams toward Pyro and Mechanic, while Ranger advances through overall Survival Level.
This order reduces the need to force several unrelated objectives into one run. It also keeps uncertain conditions visible because the client counter is checked before the build is selected. If a counter does not move, change only one suspected requirement on the next attempt and record the result.
Verify progress without inventing conditions
Open the character-selection screen before a run and record the displayed text and current counter. After the run, compare the same counter to the action you were testing, such as a Boss kill, a physical Health Pack pickup, elemental damage, or an ability activation. Repeat the test before publishing a rule when the source is non-official or the historical sources conflict.
For character roles and the full nine-Survivor overview, return to the characters guide. Once Ghost or Huntress is available, continue with the Ghost skills guide or Huntress upgrades guide. Those pages discuss builds without changing the evidence standard used for unlocks.