# 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 **$SPH** and **$USDT** 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="https://2661206929-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEYLKK6Hywm18KuTYXL9X%2Fuploads%2FXC06la2UVGfxDKHBigdv%2F%D0%98%D0%BD%D1%81%D1%82%D1%80%D1%83%D0%BA%D1%86%D0%B8%D1%8F.png?alt=media&#x26;token=32911d16-5e4b-4777-a803-6171ff120e4a" 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" %}

* **$SPH** - Game Utility token;
* **$USDT**- 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 $**USDT** on either one or both factions during the game. If the investor wins, the investor receives a reward, and all invested $**USDT** is returned to the winning team;
* **Goerli Network 1 blocktime \~ 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://goerli.etherscan.io/)
{% 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="how-to-start-playing-on-goerli-testnet-with-nft-or-usdusdt-treasury-token." %}
[how-to-start-playing-on-goerli-testnet-with-nft-or-usdusdt-treasury-token.](https://goerli-docs.theoldcastle.xyz/how-to-start-playing-on-goerli-testnet-with-nft-or-usdusdt-treasury-token.)
{% endcontent-ref %}

{% content-ref url="game-fi-elements" %}
[game-fi-elements](https://goerli-docs.theoldcastle.xyz/game-fi-elements)
{% endcontent-ref %}

{% content-ref url="rewards-after-the-battle" %}
[rewards-after-the-battle](https://goerli-docs.theoldcastle.xyz/rewards-after-the-battle)
{% endcontent-ref %}