The demo costs nothing and won't ask for a card—you can close the tab any time without signing up for anything. It's the full game, not a dumbed-down preview: same RNG, same math, same bonus triggers. The only difference is you're playing with demo credits instead of real money.
You get unlimited spins to test how often the free spins land, how the expanding Horus wilds behave on reels 2–4, and whether the symbol upgrades actually build into something. No session timer, no spin cap mentioned in the game rules. If you want to burn through 200 spins to see the bonus in action three times, go ahead.
Blueprint's demos run the identical build to the real-money version—regulators require it. What you see in practice is what you'll get when you stake actual cash. The 12 free spins trigger at the same rate, the wilds expand the same way, the upgrade system works identically.