Title: Guess the number
Description: Logic in an X tag's script: getvar() reads the typed answer, goto() picks the branch.

Q(number): I'm thinking of a number between 1 and 100. What is it?
X[javascript:
	// runs after the typed text is saved as "number"
	var n = Number(getvar('number'));
	if (isNaN(n)) { goto('nan') }
	else if (n === 42) { goto('right') }
	else if (n < 42) { goto('low') }
	else { goto('high') }
]:
Q(right): That's it! You got it.
A: Play again
	Q: GOTO:number
Q(low): Too low. GOTO:number
Q(high): Too high. GOTO:number
Q(nan): That's not a number. GOTO:number