Unlocked

Complete Autumn

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Find the secret Autumn cave

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Find all ten Autumn plant samples to take back home

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Complete the Canyons level in "Blue Sky on Mars"

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Find all ten Slushy Alien Flubber Babies in the Canyons level in "Blue Sky on Mars"

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Find all the clocks of Autumn

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Find all the clocks of Spring

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Find all the clocks of Summer

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Find all the clocks of Winter

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Complete "Blue Sky on Mars"

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Complete the game

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Watch the end credits

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Find all ten spray paint markings in the Reactor level of "Blue Sky on Mars"

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Complete the Reactor level in "Blue Sky on Mars"

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Find all ten Slushy Alien Flubber Babies in the Reactor level in "Blue Sky on Mars"

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Find all ten clocks in Space Training - Level 01

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Find all ten clocks in Space Training - Level 02

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Find all fifteen clocks in Space Training - Level 03

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Complete Spring

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Find the secret Spring cave

LockedSteam

Find all ten Spring plant samples to take back home

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Complete Summer

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Find the secret Summer cave

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Find all ten Summer plant samples to take back home

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Complete the Surface level in "Blue Sky on Mars"

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Find all ten Slushy Alien Flubber Babies on the Surface level in "Blue Sky on Mars"

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Complete the Tunnels level in "Blue Sky on Mars"

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Find all ten Slushy Alien Flubber Babies in the Tunnels level in "Blue Sky on Mars"

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Complete Winter

LockedSteam

Find the secret Winter cave

LockedSteam

Find all ten Winter plant samples to take back home

LockedSteam