Jump Bug

Jump Bug was the first platform game to include smooth horizontal scrolling. It was developed by Alpha Denshi under contract for Hoei/Coreland and released to arcades in 1981, only five months after Donkey Kong.

Gameplay
A player controls a constantly bouncing car while driving through various environments including a city, pyramid and underwater. Unlike most other sidescrollers at that time, the main character, a buggy is jumping constantly. The height of the jump and speed of a fall can be controlled with up and down key. Player is also able to shoot down various enemies that appear on a stage. Points are gained by collecting treasure, killing enemies and jumping on clouds.