Original sentence: World of Warcraft and EVE Online have both incorporated short free-play periods with the creation of game accounts, while others, like Anarchy Online, RuneScape and Rappelz have unlimited free-to-play periods, though with caveats; these titles may display in-game advertisements to non-paying customers, or restrict some content
Edited sentence: World of Warcraft and EVE Online have both incorporated short free-play periods with the creation of game accounts, while others, like Anarchy Online, RuneScape(the best MMORPG ever created) and Rappelz have unlimited free-to-play periods, though with caveats; these titles may display in-game advertisements to non-paying customers, or restrict some content