Arcade's Greatest Hits is a compilation of 6 games: Bubbles, Defender, Joust, Robotron: 2084, Sinistar, Stargate.

Defender:

Defender is a 2D side-scrolling shoot-'em-up, in which the objective is to shoot aliens, avoid projectiles and obstacles and protect humans from being captured. It was unique for its day for allowing the player to move both left and right, the maps "looping" to create a "circular" playfield. It is also the primary influence for the Sega classic, Fantasy Zone.
Configurable options: ships to start, bonus at, difficulty increase, maximum difficulty, waves per planet.

Stargate :

Defender II is the sequel to Defender, though curiously was never known as Defender II in the arcades, instead opting for the title of Stargate on grounds of legal issues (Defender II being reserved for the NES and older Atari 2600 ports). Defender II is much the same as the first game, but introduces new enemies, a cloaking device and similar minor gameplay additions.
Configurable options: ships to start, bonus at, difficulty, inviso time per ship, men to warp, last wave for warp.

Joust:

Joust is a single-screen 2D "platform game", in which players control a man riding a "buzzard", who needs to hit the heads of enemies, similar to traditional jousting.
Configurable options: lives to start, bonus at, difficulty.

Robotron 2084:

Robotron 2084 is a dual-joystick top-down shoot-'em-up, in which you attempt to save the last surviving human family from robots.

Sinistar:

Sinistar is a top-down shooter similar to Atari's Asteroids, however as well as shooting enemies, players need to locate sinibombs to prevent the creation of the extremely powerful Sinistar.

Bubbles:

Players control a bubble and need to clean a sink. Bubbles was less well received than the other games in this compilation back in 1982, so until this compilation emerged, did not see any home ports.