Variables and expressions
Scores, lives, high scores that survive a reload, and the little expression language.
5 min readVariables are declared under Assets → Variables. Each has a name, a type and a starting value.
Persistence
Mark a variable persist and it is saved to the player's
device and restored on load. That is how high scores work. The kits
conventionally call it best.
Expressions
Number fields accept arithmetic, and any bare variable name is replaced by
its value: score * 2, lives - 1,
100 + i * 60.
Showing them on screen
Add the bindText behaviour to a text entity and give it a template. Anything in braces is replaced live:
Template: SCORE {score} LIVES {lives}
Shows: SCORE 1200 LIVES 3The text updates the moment the variable changes — you do not need to refresh it from the graph.
Reacting to a change
The On Variable Changed event fires whenever a variable is
written. Most game-over logic in the kits is a single such node wired to
an If checking lives <= 0.