1. Click this link to access our NFT collections https://opensea.io/Gametrix

2. Select the created tab 

3. Choose a collection or NFT 

4. Select Buy Now

5. Select Check Out to purchase

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* You must own a NFT wallet compatible with Opensea to purchase our NFT's

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Also this video "How to Buy an NFT | OpenSea"  explains how to purchase a NFT.