Starlight Princess demo: the same skeleton, a different skin
Starlight Princess uses the pay-anywhere tumbling architecture that Pragmatic has standardised across several of its biggest titles. A six-by-five grid, symbol counts rather than paylines, removal of paying symbols, a refill from above, and a repeat until no group qualifies. Random multiplier symbols appear and resolve at the end of a tumble sequence. If that description sounds familiar, that is because the engine is deliberately reused.
It is worth being blunt about that, because a lot of slot coverage treats every release as a new invention. It is not. Studios build a mathematical framework and then re-skin it, adjusting the symbol distributions, the multiplier table and the paytable values to land on a target return and a target volatility. What differs between titles in a family is the parameterisation, not the architecture.
The Starlight Princess free play version on this page runs the real client on virtual credits, and comparing it side by side with the other tumbling titles here is the fastest way to see what is actually a difference and what is only a costume.