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70 lines
3.2 KiB
Markdown
70 lines
3.2 KiB
Markdown
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---
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title: Zaxxon
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lastpage:
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---
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# Zaxxon
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```{figure} ../../_static/videos/atari/zaxxon.gif
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:width: 120px
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:name: Zaxxon
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```
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This environment is part of the <a href='..'>Atari environments</a>. Please read that page first for general information.
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|---|---|
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| Action Space | Discrete(18) |
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| Observation Space | (210, 160, 3) |
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| Observation High | 255 |
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| Observation Low | 0 |
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| Import | `gymnasium.make("ALE/Zaxxon-v5")` |
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### Description
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Your goal is to stop the evil robot Zaxxon and its armies from enslaving the galaxy by piloting your fighter and shooting enemies. Detailed documentation can be found on [the AtariAge page](https://atariage.com/manual_html_page.php?SoftwareLabelID=606).
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### Actions
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By default, all actions that can be performed on an Atari 2600 are available in this environment. Even if you use v0 or v4 or specify full_action_space=False during initialization, all actions will be available in the default flavor.
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### Observations
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By default, the environment returns the RGB image that is displayed to human players as an observation. However, it is
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possible to observe
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- The 128 Bytes of RAM of the console
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- A grayscale image
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instead. The respective observation spaces are
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- `Box([0 ... 0], [255 ... 255], (128,), uint8)`
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- `Box([[0 ... 0]
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...
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[0 ... 0]], [[255 ... 255]
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...
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[255 ... 255]], (250, 160), uint8)
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`
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The general article on Atari environments outlines different ways to instantiate corresponding environments
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via `gymnasium.make`.
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### Arguments
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```
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env = gymnasium.make("ALE/Zaxxon-v5")
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```
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The various ways to configure the environment are described in detail in the article on Atari environments.
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| Environment | Valid Modes | Valid Difficulties | Default Mode |
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|------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------|--------------|
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| Zaxxon | `[0]` | `[0]` | `0` |
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You may use the suffix "-ram" to switch to the RAM observation space. In v0 and v4, the suffixes "Deterministic" and "Noframeskip"
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are available. These are no longer supported in v5. In order to obtain equivalent behavior, pass keyword arguments to `gymnasium.make` as outlined in
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the general article on Atari environments.
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The versions v0 and v4 are not contained in the "ALE" namespace. I.e. they are instantiated via `gymnasium.make("Zaxxon-v0")`
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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
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general article on Atari environments.
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* v5: Stickiness was added back and stochastic frameskipping was removed. The entire action space is used by default. 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 (1.0.0)
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