CREATE TABLE table_66309 ("Year" CLOB, "Arcade" CLOB, "Standalone" CLOB, "Console" CLOB, "Computer" CLOB)

In what year is Zaxxon the Standalone?
SELECT "Year" FROM table_66309 WHERE "Standalone" = 'zaxxon'
SELECT "Year" FROM "table_66309" WHERE "Standalone" = 'zaxxon'