Build and Kill Zombies Car Parts Machine: Categories, Cost & Odds

The CAR PARTS machine in Build and Kill Zombies is where you roll for vehicle parts using cash earned from runs. Parts are not bought off a shelf — you roll for them, one category at a time, at the station in the lobby. Stand next to it and a Q Select prompt appears; pressing E triggers a roll. Rolls stack, so you can end up with duplicates like x5 Glass Cylinder, and those extras are not wasted — wider plots need more cheap filler parts once you start building a proper chassis. Two separate machines handle rolling (the CAR PARTS machine and a separate support roll pool), so you can target the exact bottleneck you have rather than gambling on one combined pool. Dedicated roll stations for individual items also exist, including a Crossbow station and a Glass Cylinder station.

The four part categories

Every vehicle splits into four part categories that roll from the CAR PARTS machine:

• BLOCKS form the chassis and decide how many mounting points you have.
• ENGINES set your top speed.
• WHEELS change grip and weight.
• FUELS determine how long the run can last.

Because each category rolls separately, you can target the one bottleneck you actually have. Roll Engines and Fuels before anything else — fuel is the real constraint early on, and a fast engine with no fuel stops just as quickly as a slow one, so treat Engines and Fuels as a pair rather than chasing raw speed numbers.

Roll cost and confirmed odds

Each roll costs $50, and you pay whether or not you like the result, so leaving a run early to reroll is usually worse than finishing the run and banking the distance payout. Precise per-item drop rates are not published beyond what the result card shows — the confirmed samples observed so far are:

Prices, rarity bands, and luck

Prices scale hard with usefulness: a Glass Cylinder sits at the bottom of the pool at $15, while a Shredder — also listed as Uncommon — costs $250. Rolls produce results across four rarity bands:

• Common yields baseline blocks, wheels and fuels that fill out a starter car.
• Rare yields stronger engines, wheels and weapon mounts that carry a mid-game run.
• Epic yields high-tier parts worth rebuilding a blueprint around.
• Legendary is the rarest band, the lowest odds shown on the result card and the reason luck stacking exists.

Luck upgrades (the Luck I / Luck II skills, plus Robux luck boosts) apply to both roll machines. Higher luck does not change what a part does — it only shifts how often the rarer entries show up when you roll. Drop odds are displayed on every result card, and duplicate parts accumulate instead of vanishing. Exact odds for the Rare, Epic, and Legendary bands and for most parts in each category pool are not published, so check the result card in-game for the current numbers.

How rolls feed vehicle building

Rolled parts are assembled in Build Mode, entered with B:

• The VEHICLE tab is where you place blocks, engine, wheels and fuel — the frame everything else hangs off, so get it stable before thinking about weapons.
• The WEAPONS tab is where rolled weapons attach (a Shredder mounted on the front face, for instance, so it contacts zombies before the rest of the car does).

Parts only snap to marked mounting spots. In the lobby, a starter set from CAR PARTS gives you blocks, an engine, wheels and fuel before you have earned anything, and the CAR BUILDS menu's Fast Furious and Blue Monster blueprints list exactly which parts they need and flag missing ones — doubling as a shopping list for your next round of rolls. Once you own every part on a blueprint list, the blueprint spawns the car automatically.