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+# Gameplay document
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+
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+Description of Rift Exodus gameplay.
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+
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+## Overview
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+
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+Roguelite inspired by FTL. You drive a vehicule along the equatorial rift. If you get out the temperate belt, you loose your run. You can find modules and ressources along the way to improve your vehicule and overcome obstacles you may encounter.
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+
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+## End of game
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+
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+### Loosing conditions
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+
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+- Every pilot is dead
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+ - Extreme weather (out of temperal belt)
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+ - Bad event
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+
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+### Winning conditions
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+
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+- End found
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+ - Underground city found
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+ - Space-ship found
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+ - etc.
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+
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+## Vehicule
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+
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+### Introduction
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+
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+Your vehicule is highly modular. You can equip modules that you discover and harvest resources to fill your reservoirs up. Your vehicule configuration determines the amount of each resource you consume while moving, and can play a role in event appearance and / or outcome.
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+
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+### Resources
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+
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+The most useful resource is _mechanical energy_ which is needed to move your vehicule. Other resources can be harvest and stored by specific modules to this purpose.
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+
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+- Mechanical energy : Consumed by _movers_ to move the vehicule.
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+- Heat
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+- Cold
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+- Wood
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+- Water
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+- Gas
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+- Electricity
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+- Radioactivity
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+
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+
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+### Modules
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+
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+Each vehicule, depending on its size, has a maximum limit of number of modules.
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+
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+#### Converter
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+
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+These modules convert one or two types of resource to another.
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+
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+- Piston engine : _gas_ → _mechanical energy_
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+- Stirling engine : _heat_ + _cold_ → _mechanical energy_
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+- Electric motor : _electricity_ → _mechanical energy_
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+- Furnace : _wood_ → _heat_
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+- Evaporator : _water_ → _cold_
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+- Atomic reactor : _radioactivity_ → _heat_
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+- Refiner : _wood_ + _water_ → _gas_
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+
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+#### Container
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+
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+A container stores a specified type of resource.
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+
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+- Heat : Magma storage
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+- Cold : Liquid azote container
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+- Wood : Chest
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+- Water : Water tank
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+- Gas : Gas reservoir
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+- Electricity : Battery
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+- Radioactivity : Radioactive container
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+
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+#### Collecters
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+
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+A collecter is used to harvest resources.
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+
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+##### Time collecters
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+
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+Collect resource everywhere, but require time to perform.
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+
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+- Interchange : harvest _heat_ or _cold_ depending on weather
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+- Condenser : harvest _water_ from air
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+- Solar panel : _electricity_
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+
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+##### Biome collecters
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+
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+Can fill up storage of a specific resource completely at once, but requires a specific biome.
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+
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+- Magma collecter : _magma_ from _lava_
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+- Cold collecter : _cold_ from _ice_
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+- Saw : _wood_ from _forest_
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+- Pump : _water_ from _water_
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+
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+#### Terraformer
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+
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+Can modify types of map tiles.
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+
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+- Drill : requires _mechanical energy_ to transform _mountain_ into _plain_
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+- Water canon : requires _water_ to transform _plain_ into _water_
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+- Magma canon : requires _magma_ to transform _water_ into _mountain_
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+- Freezer : requires _cold_ to transform _water_ into _ice_
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+
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+#### Weapons
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+
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+Can make damage during pursuits.
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+
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+#### Movers
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+
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+Consume _mechanical energy_ to move the vehicule during exploration phase.
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+
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+##### Wheel
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+
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+Energy consumption : low
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+Can cross water : no
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+Can cross mountain : no
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+
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+##### Caterpillar track
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+
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+Energy consumption : medium
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+Can cross water : no
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+Can cross mountain : yes
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+
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+##### Hover
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+
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+Energy consumption : medium
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+Can cross water : yes
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+Can cross mountain : no
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+
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+##### Propeller
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+
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+Energy consumption : high
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+Can cross water : yes
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+Can cross mountain : yes
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+
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+## Exploration phase
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+
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+### Biomes
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+
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+#### Desert
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+
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+Flat and dry. More light for solar panels.
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+
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+#### Plains
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+
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+Flat and green.
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+
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+#### Water
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+
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+Difficult to cross.
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+
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+#### Mountain
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+
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+Difficult to cross. Give a extra bonus in visibility.
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+
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+#### Forest
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+
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+Slow down vehicules and reduce visibility range. Give opportunities to harvest bio resources.
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+
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+### Travel
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+
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+The cost to cross a tile depend of the equipment of your vehicule.
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