Build and Kill Zombies Rarities: Rarity Bands and Roll Odds
A compact reference to Build and Kill Zombies rarity bands, the two documented part odds (Small Engine 1 in 3, Shredder 1 in 12), how result cards display odds, and how luck affects rolls.
Build and Kill Zombies rolls use five rarity bands — Common, Uncommon, Rare, Epic, and Legendary — and every roll result card shows the odds of what you just rolled. Only two exact odds are documented outside the game itself: the Small Engine (Vehicle tab, Common) at 1 in 3 and the Shredder (Weapons tab, Uncommon) at 1 in 12. Everything else should be read from the result card in-game, since precise per-item drop rates are not published beyond what it displays.
What each rarity band typically yields
| Rarity band | What it typically yields | Where it comes from | Does luck help |
|---|---|---|---|
| Common | Baseline blocks, wheels and fuels that fill out a starter car | Both machines, most frequent outcome | Marginal — this is the floor, not the target |
| Rare | Stronger engines, wheels and weapon mounts that carry a mid-game run | Both machines once standard parts are covered | Yes — the main target of Luck I and Luck II |
| Epic | High-tier parts worth rebuilding a blueprint around | Both machines, infrequent | Yes — where stacked luck and boosts matter most |
| Legendary | The rarest rolls in the game, the reason luck stacking exists | Both machines, the lowest odds shown on the result card | Yes — the band every luck upgrade is aimed at |
The wiki's band table lists Common, Rare, Epic, and Legendary; the Uncommon band is known from its parts rather than a table row, with confirmed examples including the Shredder (spiked roller) and Glass Cylinder (contact-damage bumper). If a band row or odds value looks different when you check in-game, trust the current result card.
Verified example odds
| Part | Tab | Rarity | Roll chance |
|---|---|---|---|
| Small Engine | Vehicle | Common | 1 in 3 |
| Shredder | Weapons | Uncommon | 1 in 12 |
These are the only two per-part figures documented; expect balance changes since the game launched August 19, 2026, and re-check the result card for current values.
How displayed odds work
Pressing Q picks a category, CONFIRM locks it, and E rolls, showing rarity plus odds on the result. As the wiki puts it, "Drop odds are displayed on every result, which removes most of the guesswork about whether a band is realistically reachable." Higher luck does not change what a part does — it only shifts how often the rarer entries show up when you roll. Luck improvements apply to both roll machines at once, and boosts (Luck I/II, 2x, 4x, Server Luck) shift band frequency but never guarantee an outcome.
Rarity is not the same as value
Rarity alone doesn't decide what's worth chasing: as the tier-list criteria note, "a common fuel part that extends runs is worth more than a rare weapon you cannot mount." The Uncommon band illustrates this — parts like the Shredder and Glass Cylinder are cheap enough to fit on run one, making them practical early targets even though higher bands exist.