System mechanic — not covered elsewhere

Aircraft and Rockets

Seven aircraft you actually fly, and five rockets you spend — but only two of those five currently go anywhere reachable

Blister Online splits vehicles into two genuinely different kinds. Aircraft are craftable, repairable, reusable machines you fly around Earth — and, since flying into the black hole, potentially somewhere much stranger. Rockets are a different kind of item entirely: each one is spent on a single one-way launch to a specific off-world destination rather than flown and landed. Neither covers ground travel — see The Garage for the game's one drivable car.

The seven aircraft

Every aircraft carries its own health, damaged by hazards in flight, and can be repaired at ¤2 per missing HP at any time — a fully wrecked Cessna and a lightly scuffed one both repair for exactly what they're actually missing, never a flat fee.

Owning any aircraft also opens up The Floating Islands — five sky biomes reachable only by flight, with their own bosses and top-tier weapons.

The rocket ladder

Owning the right rocket isn't enough on its own — every destination past the Moon also demands a minimum Total Level before it'll let you through, checked separately from whether you've actually built the craft. The Moon is the one deliberate exception, gated on nothing at all — and once you're there, The Moon Base lets you set a respawn point and run offline resource production between visits. These numbers have moved before (the Sun's requirement alone has been 3,000, then 1,200, before settling at its current value), so a player could in principle build the game's most expensive craft and still be turned away at the door if their level hasn't caught up yet.

Vulcanis, Kryon, and Aurelis are all currently switched off — deliberately, and reversibly, rather than deleted. Only Earth, the Moon, and the Sun are reachable in the current build. The three rockets to the disabled worlds still exist as items and can still be crafted, but there's nowhere for them to actually take you right now.

The Solar Diver is the odd one out even among rockets: it isn't flown or landed anywhere at all — it's spent purely on the act of departure, a one-way trip into the Sun itself. Two of its own crafting materials are normally only obtainable on Vulcanis, so with that world switched off, the recipe was rebalanced to drop those specific ingredients rather than leaving the game's single most expensive craft quietly impossible — a player could otherwise have farmed everything else first and only found out at the very end that one ingredient could never be gotten at all.

Stuck off-world? Press [/]

If you find yourself stranded on the Moon or the Sun with no way to get home — a lost or destroyed rocket, for instance — pressing [/] asks "STRANDED? Give up here and wake on Earth," and confirming brings you straight back. It's built on the same mechanism as an ordinary death, so it costs exactly what dying already costs (which, per the Walk Back, is nothing at all beyond the walk itself) — your character and any rocket you own are both kept. The key does nothing on Earth, where there's nothing to escape from.

The Solar Diver's recipe isn't the only thing this shutdown reaches — two of the sixteen relics in the Spire of Years' own Reliquary are also Vulcanis-only, capping that collection below full until the world returns.

Version history

• Vulcanis, Kryon, and Aurelis switched off, on request — done through a single shared flag rather than editing each world's geometry, enemies, recipes, and travel chart by hand, specifically so re-enabling any of them later is one flag flip rather than reversing dozens of separate edits.
• The Solar Diver's recipe rebalanced around the shutdown, dropping the ingredient lines that named the now-unreachable Vulcanis rather than inventing a new, easier source for them — the craft became more expensive in what remains obtainable, not cheaper, since the removed cost was redistributed across the remaining ingredients instead of simply vanishing.
• The Total Level gates finally published to the guidebook. The four off-Moon destinations had always refused a player below their own minimum level, but that number lived only inside the travel code itself — the guidebook described four worlds and never once mentioned any of them had a level requirement at all, so a player could build the Solar Diver, the single most expensive craft in the game, and only find out at the launch pad that their level wasn't high enough yet.

Trivia

• The Recovered Saucer and the Boeing 747 are the only two aircraft in the game with no top speed at all — everything else in the roster tops out at a fixed number.
• Every rocket is defined internally with every flight stat set to zero — thrust, speed, turning, lift — because a rocket is never actually piloted the way an aircraft is; it's simply spent to trigger a launch.