> For the complete documentation index, see [llms.txt](https://beam-docs.theoldcastle.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://beam-docs.theoldcastle.xyz/overview.md).

# Overview

**The Old Castle Defense** is the fairest and most transparent play-to-earn (P2E) on-chain game, where **players** fight battles and sieges using their **Terrible Creatures** and **Knights of the Kingdom** NFTs and are rewarded with **$SPH** and **$MC** tokens for victories. **Investors** are the third party of participants who can change the outcome of battles by investing in any of the teams, buying attacks, and saving NFTs from death. All funds from **investors** are going to the treasury of both **factions**. 

<figure><img src="/files/OnFuF2kTcfQiUJGJVpk8" alt=""><figcaption></figcaption></figure>

The winning **faction** wins the treasury of the losing team. Winning **faction** treasury refunds back to **investors** with rewards.

The game doesn't have timing. It's the on-chain game - it has blocks, where 1 block ≈ 5 sec.

{% hint style="info" %}

* **$SPH** - Game Utility token;
* **$MC** - Treasury coin;
* **Player -** a user that owns an NFT from Terrible Creatures or Knights of the Kingdom NFT collections.&#x20;
* **Factions -** Opposing sides: the Terrible Creatures versus the Knights of the Kingdom;
* **Investor -** a user who has not staked an NFT, but has staked $**MC** on either one or both factions during the game. If the investor wins, the investor receives a reward, and all invested $**MC** is returned to the winning team;
* **Beam Network 1 block-time \~ 15 seconds.**
* **The Siege -** the length of each entire game, approximately lasting 80,640 blocks (\~14 days);
* **Battle -** a game event that takes place every 960 blocks (\~4 hours).

You can track blocks by the [block explorer](https://subnets-test.avax.network/beam)
{% endhint %}

{% embed url="<https://www.youtube.com/watch?t=1s&v=n1J3004v5Mk>" fullWidth="false" %}
Check out The Old Castle Defense Game-flow directly from the Mobile wallet.
{% endembed %}

{% content-ref url="/pages/ZQNJ1WsGOuxJb9qjP7B5" %}
[How to start playing on Beam Testnet with NFT or $MC - treasury token.](/how-to-start-playing-on-beam-testnet-with-nft-or-usdmc-treasury-token..md)
{% endcontent-ref %}

{% content-ref url="/pages/VJvxpk4IZf6odFlusjr7" %}
[Game-Fi Elements](/game-fi-elements.md)
{% endcontent-ref %}

{% content-ref url="/pages/VLO6pMLTO13NTnRquFLH" %}
[Rewards After The Battle](/rewards-after-the-battle.md)
{% endcontent-ref %}