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---
title: Solaris
---
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# Solaris
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```{figure} ../../_static/videos/atari/solaris.gif
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:width: 120px
:name: Solaris
```
This environment is part of the < a href = '..' > Atari environments< / a > . Please read that page first for general information.
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| | |
|---|---|
| Action Space | Discrete(18) |
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| Observation Space | Box(0, 255, (210, 160, 3), uint8) |
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| Import | `gymnasium.make("ALE/Solaris-v5")` |
For more Solaris variants with different observation and action spaces, see the variants section.
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## Description
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You control a spaceship. Blast enemies before they can blast you. You can warp to different sectors. You have to defend Federation planets, and destroy Zylon forces. Keep track of your fuel, if you run out you lose a life. Warp to a Federation planet to refuel. The game ends if all your ships are destroyed or if you reach the Solaris planet.
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For a more detailed documentation, see [the AtariAge page ](https://atariage.com/manual_html_page.php?SoftwareLabelID=450 )
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## Actions
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Solaris has the action space `Discrete(18)` with the table below listing the meaning of each action's meanings.
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As Solaris uses the full set of actions then specifying `full_action_space=True` will not modify the action space of the environment if passed to `gymnasium.make` .
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| Value | Meaning | Value | Meaning | Value | Meaning |
|---------|--------------|---------|-----------------|---------|----------------|
| `0` | `NOOP` | `1` | `FIRE` | `2` | `UP` |
| `3` | `RIGHT` | `4` | `LEFT` | `5` | `DOWN` |
| `6` | `UPRIGHT` | `7` | `UPLEFT` | `8` | `DOWNRIGHT` |
| `9` | `DOWNLEFT` | `10` | `UPFIRE` | `11` | `RIGHTFIRE` |
| `12` | `LEFTFIRE` | `13` | `DOWNFIRE` | `14` | `UPRIGHTFIRE` |
| `15` | `UPLEFTFIRE` | `16` | `DOWNRIGHTFIRE` | `17` | `DOWNLEFTFIRE` |
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## Observations
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Atari environments have three possible observation types: `"rgb"` , `"grayscale"` and `"ram"` .
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- `obs_type="rgb" -> observation_space=Box(0, 255, (210, 160, 3), np.uint8)`
- `obs_type="ram" -> observation_space=Box(0, 255, (128,), np.uint8)`
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- `obs_type="grayscale" -> Box(0, 255, (210, 160), np.uint8)` , a grayscale version of the "rgb" type
See variants section for the type of observation used by each environment id by default.
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## Rewards
You gain points for destroying enemies, rescuing cadets, making it through a corridor, destroying enemy planets etc. For a more detailed documentation, see the [AtariAge page ](https://atariage.com/manual_html_page.php?SoftwareLabelID=450 ).
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## Variants
Solaris has the following variants of the environment id which have the following differences in observation,
the number of frame-skips and the repeat action probability.
| Env-id | obs_type= | frameskip= | repeat_action_probability= |
|-----------------------------|-------------|--------------|------------------------------|
| Solaris-v0 | `"rgb"` | `(2, 5)` | `0.25` |
| Solaris-ram-v0 | `"ram"` | `(2, 5)` | `0.25` |
| Solaris-ramDeterministic-v0 | `"ram"` | `4` | `0.25` |
| Solaris-ramNoFrameskip-v0 | `"ram"` | `1` | `0.25` |
| SolarisDeterministic-v0 | `"rgb"` | `4` | `0.25` |
| SolarisNoFrameskip-v0 | `"rgb"` | `1` | `0.25` |
| Solaris-v4 | `"rgb"` | `(2, 5)` | `0.0` |
| Solaris-ram-v4 | `"ram"` | `(2, 5)` | `0.0` |
| Solaris-ramDeterministic-v4 | `"ram"` | `4` | `0.0` |
| Solaris-ramNoFrameskip-v4 | `"ram"` | `1` | `0.0` |
| SolarisDeterministic-v4 | `"rgb"` | `4` | `0.0` |
| SolarisNoFrameskip-v4 | `"rgb"` | `1` | `0.0` |
| ALE/Solaris-v5 | `"rgb"` | `4` | `0.25` |
| ALE/Solaris-ram-v5 | `"ram"` | `4` | `0.25` |
## Difficulty and modes
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It is possible to specify various flavors of the environment via the keyword arguments `difficulty` and `mode` .
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A flavor is a combination of a game mode and a difficulty setting. The table below lists the possible difficulty and mode values
along with the default values.
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| Available Modes | Default Mode | Available Difficulties | Default Difficulty |
|-------------------|----------------|--------------------------|----------------------|
| `[0]` | `0` | `[0]` | `0` |
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## Version History
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A thorough discussion of the intricate differences between the versions and configurations can be found in the general article on Atari environments.
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* v5: Stickiness was added back and stochastic frame-skipping was removed. The environments are now in the "ALE" namespace.
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* v4: Stickiness of actions was removed
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* v0: Initial versions release
