What this actually is, and what it is not
A portable phone projector is a small device that throws whatever is on your phone's screen onto a wall, a ceiling or a floor. It is not a hologram and it does not create anything that floats in the air. What it does very well is cast a large, bright image onto a flat surface, and that is more than enough to play Twister without owning the mat.
The idea is simple: the app draws the classic mat, the projector throws it onto the floor, and the players stand on the projected circles. The app calls each move aloud, so nobody has to look at a screen or hold a device. You get a playable mat anywhere you have a bare floor and a dim room.
What you need
You need three things: a projector, a phone or tablet to drive it, and a floor with a few feet of clear space around it. Most of the tiny projectors sold as phone accessories mirror your screen wirelessly or through a USB-C or HDMI adapter. Check which method yours uses before you plan the room layout.
Because the projector is mirroring your screen, whatever the app shows is what lands on the floor. Open Projection Mode and the mat fills the display with nothing else on screen, which is exactly what you want. Close it with the exit button when the game ends.
Setting up the projector safely
Placement matters more than any setting. Put the projector behind or above the players, angled down at the floor, so that nobody walks through the beam or blocks it. A small tripod, a shelf or a stack of books all work as long as the device is stable and cannot be knocked over mid-game.
Route the charging cable and any video cable along a wall and cover them with a rug or tape, because a cable crossing the play area is the single most likely way someone gets hurt. Keep the room dim so the image reads clearly, but not so dark that players cannot see each other. Never let anyone look directly into the lens, and keep the projector away from young children.
Getting the mat the right size and sharpness
Move the projector closer to the floor and the mat shrinks, move it further away and the mat grows. Aim for a mat roughly four by six feet, which is about the size of the real thing, so that the circles are close to a foot across. If your projector has keystone correction, use it to square up the edges once you are happy with the size.
Focus the lens until the circle outlines are crisp, then mark the four corners of the mat with a small piece of tape. Projectors drift if the table gets bumped, and corner marks let you nudge it back in seconds. If your projector has a battery, plug it in anyway, because a long game plus a bright image drains small batteries quickly.
Running the game
Open Projection Mode, add your players on the main screen, then tap the large SPIN button on the projected display. The current move appears in huge letters at the top and the matching color column on the mat glows, so even players at the far end of the mat can see where to reach. The app speaks the move aloud at the same time.
If you want a fully hands-free game, switch on auto-spin and set an interval before you start. The mat keeps calling moves on its own, which is ideal when everyone is tangled up and nobody can reach the phone.
Practical safety notes
A projected mat is light, not a physical object, so it offers no grip or cushioning. Play on a clean, dry, non-slip floor, keep socks or bare feet rather than smooth shoes, and keep the area free of furniture with hard edges. Because the mat is only an image, players can wander off it more easily than on a real mat, so glance at the floor markings now and then to keep everyone in bounds.
Take breaks, keep water nearby, and stop if anyone feels a strain. When the game is over, exit Projection Mode and let the projector cool down before packing it away.
If you do not own a projector
You can still play with the digital spinner on its own. Use it alongside a physical mat, or set up a DIY mat with chalk circles on a driveway, colored paper squares taped to the floor, or cushions in the four colors. The spinner calls the moves either way, and the spin history log keeps a record of every call for settling disputes.