Identifying the Black & Green Ball-Paddle Game: Pong

You're describing Pong (1972, Atari). The original arcade cabinet used a black CRT monitor with green phosphor (monochrome), displaying white paddles/ball on green. Home versions (Home Pong, Sears Tele-Games) used TV RF – color varied.

Online Playable Versions

• ponggame.org – Faithful HTML5 clone.
• Atari Official – Browser emulation.
• GitHub SDL_Pong – Source code.
• Search "Pong" on Scratch, itch.io for variants (3D, multiplayer, AI).

If you recall color paddles (orange/blue) or power-ups, it's a later clone (Breakout, Arkanoid, Popcorn, Shatter). Pure black/green = classic Pong.