The copyright text appeared like this in the US version
GUARDIAN TOY
©1989 SYNERGISTIC SOFTWARE, INC.
AND VIRGIN MASTERTRONIC LTD.
MADE IN EUROPE.
©1990 ULTRA GAMES, INC.
ALL RIGHTS RESERVED.
PROGRAM AND AUDIOVISUAL BY
RARE LTD. / RARE COIN-IT INC.
LICENSED BY
NINTENDO OF AMERICA, INC.
The copyright text appeared like this in the European version.
GUARDIAN TOY
©1989 SYNERGISTIC SOFTWARE, INC.
AND VIRGIN MASTERTRONIC LTD.
MADE IN EUROPE.
©1991 PALCOM SOFTWARE, INC.
ALL RIGHTS RESERVED.
PROGRAM AND AUDIOVISUAL BY
RARE LTD. / RARE COIN IT INC.
LICENSED BY NINTENDO