A free trial is only free if you cancel in time. Each listing here gives the trial length and whether a card is needed, and our free trial reminder works out the exact cancel-by time for you.
Valve / individual publishers
Most weeks one or more paid Steam games can be played in full for free over a weekend, usually with a discount if you decide to buy. You do not keep the game afterwards.
Microsoft / Xbox
Almost every week Xbox lets Game Pass members play a handful of paid games free over the weekend, usually with a discount to buy. Achievements earned carry over if you purchase.
Nintendo periodically lets Switch Online members download and play a full paid game for a limited time. Save data stays if you buy the game afterwards.
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