Before buying a game key: four details
Check platform, edition, region and product type before judging a game offer.

Read the contents
Standard, Deluxe and Complete editions may contain different items. A DLC is an expansion and may require a separately owned base game. Read the retailer’s included-content list.
Check activation
Confirm the launcher: a Steam key does not automatically work in another store. The activation region must match your account. Check supported operating systems and any product-specific restrictions before payment.
Buy at the retailer
CritLoot’s game links lead to an external retailer. Binding prices, delivery information and activation terms are shown there. Keep your receipt and the product description. Never publish a purchased code in a chat or review.
Further reading: Fanatical ↗
Examples and checklists are guidance, not promises of price, stock or delivery. Check game-specific details against the linked sources.