It is OK to edit a system level, but you MUST save the level in one of your own games. You are not just taking a peek at the hidden ladders and fall-through bricks, are you?: -)
Mae' n iawn golygu lefel gysawd, ond RHAID i chi gadw' r lefel mewn un o' ch gemau eich hun. Gobeithio nad ydych chi' n ceisio cael cipolwg ar yr ysgolion cudd a' r briciau twll: -)