- h eld ▁Matt el ▁games ▁engineering ▁team . ▁During ▁ 1 9 8 1 ▁Matt el ▁h ired ▁program mers ▁as ▁fast ▁it ▁could . ▁ ▁Early ▁in ▁ 1 9 8 2 ▁Matt el ▁Electron ics ▁re located ▁from ▁Matt el ▁headquarters ▁to ▁an ▁un used ▁industrial ▁building . ▁ ▁Office ▁renov ation ▁work ▁happened ▁as ▁new ▁staff ▁moved ▁in . ▁To ▁keep ▁these ▁program mers ▁from ▁being ▁h ired ▁away ▁by ▁rival ▁At ari , ▁their ▁identity ▁and ▁work ▁location ▁was ▁kept ▁a ▁closely ▁guard ed ▁secret . ▁In ▁public , ▁the ▁program mers ▁were ▁referred ▁to ▁collect ively ▁as ▁the ▁Blue ▁Sky ▁R angers . ▁ ▁Most ▁of ▁the ▁early ▁games ▁were ▁based ▁on ▁traditional ▁real - world ▁concepts ▁such ▁as ▁sports , ▁with ▁an ▁emphas is ▁on ▁real ism ▁and ▁depth ▁of ▁play ▁within ▁the ▁technology ▁of ▁the ▁day . ▁ ▁The ▁Int ell iv ision ▁was ▁not ▁market ed ▁as ▁a ▁to y ; ▁as ▁such , ▁games ▁such ▁as ▁Sea ▁Battle ▁and ▁B - 1 7 ▁Bom ber ▁are ▁not ▁made ▁in ▁a ▁pick - up - and - play ▁format ▁which ▁ar cade ▁style ▁games ▁are . ▁ ▁Reading ▁the ▁instructions ▁is ▁often ▁a ▁pr ere quis ite ▁to ▁play . ▁ ▁Every ▁cart ridge ▁produced ▁by ▁Matt el ▁Electron ics ▁included ▁two ▁pl astic ▁controller ▁" over l ays " ▁to ▁help ▁navigate ▁the ▁ 1 2 ▁key pad ▁buttons , ▁although ▁not ▁every ▁game ▁made ▁use ▁of ▁the ▁key pad . ▁ ▁Matt