In the '80s Namco released a bunch of board game versions of various popular video games - (Super) Xevious being one of those titles. As the board game was only released in Japan, the instructions are, of course, not in English. Here are all the rules traslated into English plus some extra material:

ENGLISH RULES

Game pieces
Preparations
Movement
Attack Strength Sheet
Locations

STAGE MAPS

Stage 1 - To The Clouds
Stage 2 - Into Andor Genesis
Stage 3 - Caverns
Stage 4 - Tunnel
Stage 5 - Volcanic Zone
Stage 6 - Gump Approach
Stage 7 - Gump Fortress

CARDS

Battle Cards
Super Xevious Cards

MISC

Illustrations