I saw that you could win PSOne Classics on the XMB notification thing, so I Googled it and found out that you can win three PSOne Classics by going to the PS4 experience. I used home one time a long time ago, trying it again now just to get these free games.
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Free PSX games are Destruction Derby, Twisted Metal, and Warhawk. Click this link if you want to be able to find the cards quick and then get out of PS Home ASAP.