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As the wait for more Deltarune continues, Undertale goes on sale for just $1 on Steam and reaches a new peak player count after 10 years

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By Anna Koselke published 17 March 2025

The sale ends March 20

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Undertale
(Image credit: tobyfox)
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As the spring Steam sale carries on with Undertale selling for just $1, solo developer Toby Fox shares that the 2015 RPG has just hit a major milestone 10 years after its release – a new peak player count.

Revealing the impressive new peak in a recent post, Fox celebrates the fresh influx of players and hints that the unmissable $1 sale still has "a few more days" to go now. "Since going on sale on Steam for only $1," writes the dev, "Undertale reached a new peak of concurrent players for the first time since 2015!" Attached is a screenshot showcasing 10,739 players as the new all-time peak for Undertale – and what's more, this number actually grew, too.

Since going on sale on Steam for only $1, UNDERTALE reached a new peak of concurrent players for the first time since 2015!(It's still on sale for a few more days...) pic.twitter.com/wlwcnwnGgdMarch 15, 2025

The current all-time peak was hit yesterday and stands at a whopping 11,071 players, a whole 332 more than when Fox posted just two days ago. It could go up, too – as Fox himself says, "It's still on sale for a few more days" – so there's plenty of time for even more new fans to hop into the 2015 gem. As for the old record almost a decade ago, it stood at 10,473 players, which is an entire 598 users below yesterday's exciting peak.

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There's no better time than now to experience Undertale if you already haven't – after all, Fox is currently wrapping up Chapters 3 and 4 of Deltarune, which has been in the works for over six years now, with testing on PlayStation 5 recently commencing and apparently going well. The follow-up to his 2015 banger is entirely free, too, so you can get into the duo for just $1 during the Steam Spring Sale – an unbeatable deal if you ask me.

Hungry for more? While you wait, here are some of the best games like Undertale around.

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Anna Koselke
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After spending years with her head in various fantastical realms' clouds, Anna studied English Literature and then Medieval History at the University of Edinburgh, going on to specialize in narrative design and video game journalism as a writer. She has written for various publications since her postgraduate studies, including Dexerto, Fanbyte, GameSpot, IGN, PCGamesN, and more. When she's not frantically trying to form words into coherent sentences, she's probably daydreaming about becoming a fairy druid and befriending every animal or she's spending a thousand (more) hours traversing the Underdark in Baldur's Gate 3. If you spot her away from her PC, you'll always find Anna with a fantasy book, a handheld video game console of some sort, and a Tamagotchi or two on hand.

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