Three new reward-unlock engines: inline three-cylinder, flat-six and supercharged V8. Improved workshop goals, engine collection and same-rules personal records. Rebalanced four-, six-, eight- and twelve-cylinder challenges. Existing online leaderboards and records are preserved; each new engine has its own board.

• Free Run: launch a built engine from My Workshop and play without a time limit. • Adjust the throttle and engine load, and start or stop the engine whenever you like. • Passing every Control or Response test segment saves its shelf stamp immediately and shows it on the completion screen.

Two new engines: a free inline-two two-stroke and a reward-unlockable V12. Each has its own Game Center leaderboard. The workshop now lets you revisit a weak build stage and collect engine stamps. Ignition taps are more reliable, especially during the V12 sequence. Retro pixel visuals and engine response have been refined.

New inline-six and V8 engines bring the workshop to 10 designs. Take your finished build through a 12-second throttle test: build quality affects heat, vibration and response. The separate control score does not change rankings. Choose an optional rewarded ad for one engine or a one-time purchase for all engines and no ads. Existing Remove Ads owners get both new engines without another purchase.

Eight engine-specific Game Center leaderboards, a redesigned pixel-art app icon, V-twin and boxer-four engines, connected engine mechanisms, clearer ignition judgment and ten languages.

Added advertising privacy choices and expanded game localization to seven languages.

Minor stability improvements.