Question: In what year is Zaxxon the Standalone?
SQL: SELECT "Year" FROM "2-1851722-48" WHERE "Standalone" = 'Zaxxon';

Question: What is the Standalone in the year when Space Invaders is the Console?
SQL: SELECT "Standalone" FROM "2-1851722-48" WHERE "Console" = 'Space Invaders';

Question: What is the Standalone when Tron is the Arcade?
SQL: SELECT "Standalone" FROM "2-1851722-48" WHERE "Arcade" = 'Tron';

Question: What is the Console when Space Invaders is the Arcade?
SQL: SELECT "Console" FROM "2-1851722-48" WHERE "Arcade" = 'Space Invaders';