You can use
[pascal]{$H+}[/pascal]

and

[pascal]{$H-}[/pascal]

to turn on/off huge-strings respectively in your code

I always add in {$H+} at the top of my units/project file to make sure like so:

[pascal]Unit state_playgame;
{$IFDEF fpc}
{$mode delphi}
{$ENDIF}
{$H+}
Interface

Uses[/pascal]

cheers,
Paul