How to Get Secret Units in 8 Bit Tower Defense: Rates and Banners
Secret is 8 Bit Tower Defense's rarest unit tier at a 0.01% base summon rate. See the named Secret unit Headless Horseman, the Hollow Night banner, and which summon routes list Secret units.
Quick answer
Secret is the fifth and rarest unit tier in 8 Bit Tower Defense. The base summon menu's rates screen lists Secret at 0.01%, and the Hollow Night event banner has shown Headless Horseman as a Secret unit at a 0.02% rate.
- The game's 50+ collectible units fall into five rarities: Rare, Epic, Legendary, Mythic and Secret.
- Base summon rates: Rare 70.74%, Epic 26%, Legendary 3%, Mythic 0.25%, Secret 0.01%.
- Headless Horseman is listed on the Hollow Night event banner as SECRET at 0.02%.
- A ten-pull in the SUMMON menu costs 500 gems, and new discoveries are added to your Index.
Secret pulls don't come often — at the listed base rate, a Secret unit works out to roughly a 1-in-10,000 summon. This guide covers what Secret rarity means in 8 Bit Tower Defense, which named Secret unit the game's summon screens have shown, and which summoning routes list Secret units.
What Secret rarity is
Secret is the fifth tier in the game's five-tier rarity system. The official game description lists its 50+ collectible units as "Rare, Epic, Legendary, Mythic and Secret", and the summon menu's rates screen shows those same five tiers in the same order.
It is also the rarest of the five. The rates screen lists Secret at a 0.01% base rate — a twenty-fifth of Mythic's 0.25% and a small fraction of Rare's 70.74%. At that rate, Secret is a long-term collection goal rather than something you stumble into during your first sessions.
| Rarity | Base summon rate |
|---|---|
| Rare | 70.74% |
| Epic | 26% |
| Legendary | 3% |
| Mythic | 0.25% |
| Secret | 0.01% |
These are the rates the base summon menu's rates screen displays. Event banners list their own figures — the Hollow Night banner, covered below, shows different numbers for its featured units — so check the rates shown in game before committing gems.
Headless Horseman: the named Secret unit on the Hollow Night banner
The named Secret unit shown on the game's summon screens so far is Headless Horseman. It appears on the Hollow Night event banner, which features two units:
Data table
| Unit | Rarity | Listed rate | Banner |
|---|---|---|---|
| Headless Horseman | Secret | 0.02% | Hollow Night |
| Grim Reaper | Mythic | 0.5% | Hollow Night |
Both featured units are listed at better-than-base odds: Headless Horseman's 0.02% is double the 0.01% base Secret rate, and Grim Reaper's 0.5% is twice the 0.25% Mythic base rate. That gives you an idea of what the Hollow Night banner offers — improved odds on its featured event units, for both the Mythic and the Secret slot.
One practical caveat: the recorded view of the banner showed its units and their rates, but not which currency it uses or how a pull is initiated there. Open the Hollow Night banner in game to confirm what a pull costs before planning around it.
Summoning routes that list Secret units
The game's summon screens list Secret units in two places:
- The base SUMMON menu. Its rates screen lists Secret as the fifth tier at 0.01%, so Secret appears in the ordinary summon rates listing as well as on event banners like Hollow Night.
- The Hollow Night event banner. It lists Headless Horseman as a SECRET unit at 0.02%.
In the recorded gameplay, one SUMMON menu with a single rates screen handled every summon; nothing rarity-specific was shown. The tutorial points new players there early with "Open SUMMON to call some in", a ten-pull (SUMMON x10) costs 500 gems, and every summon you perform adds newly discovered units to your Index. Gems are the summon currency shown, so a Secret chase mostly comes down to how many ten-pulls you can fund — see how to get gems for ways to build your balance.
Checking which Secret units you own
The Units inventory screen can be filtered by rarity, with filters for ALL, RARE, EPIC, LEGENDARY, MYTHIC and SECRET. Selecting SECRET narrows your collection down to just your Secret units, which is the quickest way to see how your pulls are going. Newly discovered units are added to the Index as you summon them.
Where to go next
- How to get units covers the full acquisition picture beyond Secret.
- Units list shows the whole roster in one place.
- Unit rarities compares every tier in the system.
- How to get gems helps fund the summons.