If you liked
Kami nomi zo Shiru Sekai
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...then you might like
Nisekoi
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Nisekoi and TWGOK are fairly light-hearted harem-style manga, with both stories taking place in contemporary Japanese school settings. Both utilise back-story to drive the romance sub-plots, with Nisekoi adopting a fated-love scenario and TWGOK basing it's various character plots on a more supernatural stage. The humour and slice-of-life elements also make both series easy to consume in either small quantities, or rush through in one long burst.
If you liked
Liar Game
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...then you might like
Gamble Fish
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The primary plotlines in these two manga are similar in a fundamental sense, with the protagonists of both utilising trickery and ingenious plots to win a series of high-stakes games. In both cases, these games are merely a means to an end of bringing down large establishments. The primary draw in both cases relates to the antics of the protagonists, who possess an almost arrogant sense of confidence and the ability to overcome seemingly insurmountable odds through the use of their intellect. There's a fairly standard pattern of "looks like he's losing, sudden win" syndrome in both cases, but given how the two pieces are structured it's actually gratifying when the various strategies are revealed.
If you liked
Sword Art Online
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...then you might like
Btooom!
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These two series both focus on a forced-game-world setting, with the primary characters in each being pushed into scenarios where their survival and development are contingent on synchronising with the peculiar rule-sets of their new worlds. The protagonists in both cases begin the series as socially inept but highly proficient gamers, demonstrating emotional and mental developments as the series continues. While Btooom! arguably explores more serious themes compared to the more accessible SAO, both are good entertainment in any regard.