Level 3 for the Coffee Machine and the Coal Grill.
New
Machine Upgrades: A new UPGRADES tab in the shop terminal. Each machine has one card with its level in the corner. Buy the next level any time and it is installed when the day ends. The last level shows MAX.
Microwave Level 2 and 3: Level 2 adds a second shelf, so two plates cook at once. Level 3 has five turntables, even upside down, so five plates cook at once.
Coal Grill Level 2: An upper rack with 12 coals on each rack, 24 per run. It comes with a square coal pot that carries all 24 in one go.
Coffee Machine Level 2: Coffee pours itself. Take a mug and a fresh one slides over from the cup rack, fills up and waits for the next order.
Upgrade Reveal: The morning after an upgrade, a short camera shot shows the new machine and the top-left banner lists what was upgraded.
Gameplay Changes
Upgrades can be bought any time during the day, not only after closing. They are still installed when the day ends.
The first time the smoking effects kick in, a hint tells you the motion can be turned off in Settings.
Fixes
Pressing the bell right as the day started could leave your arm stuck out and block all interaction.
The crew could get stuck between the shelves in and around the elevator.
Disco beams and drive-thru lamps lit up the other floor.
A streak of sunlight showed behind an upgraded seat next to the fire cabinet.
Other
Smoother frame rate in busy lounges: less work every frame, hidden areas are skipped and the lobby flight uses fewer particles.