RimWorld moves from Unity to Waylith Engine in patch 1.7: what changes for players, mods and paying in Steam

What Ludeon announced

In a Steam update, Ludeon Studios said that in patch 1.7 its colony-building sim RimWorld is moving off Unity onto an in-house engine called Waylith Engine. For a project that has leaned on a huge mod scene for years, that's a rare and risky step — but the studio insists mods won't suffer.

New engine, same game

Like thousands of other indie projects, RimWorld ran on Unity for years. Ludeon is now moving to its own solution, which the studio says is faster. The migration lands in update 1.7.

The important part: the developers stress the game will stay visually recognizable rather than turn into a remake. This is an engine swap under the hood, not a different game.

Mods are the big question

It's the thousands of mods that keep RimWorld alive years after release. An engine change usually means a large share of mods stop working: APIs shift, asset paths change, loading logic breaks.

Ludeon claims it managed the transition and mods will keep working. That sounds almost too good to be true — and it's the thing to watch after 1.7 ships. Real compatibility only gets proven in practice, once mod authors start pushing updates.

Buying the game, DLC and paying in Steam

RimWorld is sold on Steam at the platform's regional pricing. If you're buying from a country where local bank cards don't go through on Steam, the routine is standard:

• issue a virtual card from an international payment system (Visa or Mastercard) funded in the store's currency;
• keep a buffer on it — the game's price plus a possible conversion fee;
• link the card to your Steam account and pay for the cart;
• if the payment is declined, check that online transactions are enabled and there's enough to cover conversion.

RimWorld DLC and the soundtrack are bought the same way, as separate cart items. Check the current price and discounts on the game's Steam page — they change with regional sales.

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Should you wait for 1.7

If you're only eyeing RimWorld, patch 1.7 is no reason to hold off: the base game isn't going anywhere, and the update is free for all owners. If you're already running a build with a hundred mods, it's reasonable to wait for early compatibility reports after release before updating.

FAQ

Do I have to buy the game again after the engine switch?
No. Waylith Engine is an internal change, and update 1.7 is free for everyone who already owns the game.

Will my mods break?
Ludeon says no. That only gets confirmed after release and mod author updates.

How do I pay for RimWorld if my card won't go through on Steam?
With a virtual card from an international payment system funded in the store's currency with online payments enabled.

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