Class { #name : #Challenge, #superclass : #Object, #category : #CTF } { #category : #decoration } Challenge class >> prepare [ Metaclass compile:'>> selector LookupError signal'. ] { #category : #accessing } Challenge >> flag [ | caller | caller := thisContext client. ((caller class) = Squeak) ifTrue: [ ^ 'FLAG' ]. ^ 'Only a Squeak can do that'. ]