Crew board, crew leave, crew arrive in threes. How many are aboard now? Sums first, then differences, then products, then all of it mixed. Mental arithmetic with a manifest.
Read the manifest, pick the answer (tap, or 1 · 2 · 3). Adds first, then subtracts, then multiplies, then mixes.
Three spots on this page — top, middle, foot — priced top-down. The machine runs on them. Nothing else here is for sale but vessels.
This machine is free and sponsor-fueled. Scores are for the board and for discounts on vessels — never for prizes behind a buy-in.
Every control is a big button, a number key, or a tap on the screen. Day mode is one tap. Every free machine has a DAILY board that is the same for everyone. Scores live on your device.