Which is the oldest version of Bubble Bobble

Bubble Dragon is a casual game developed by TAITO and first released in 1994. Gameplay consists of players shooting colored beads from the marble launching pad in the center below, and more than three beads of the same color connected will disappear. It also supports two-player games, but in this mode, the two players compete against each other: one eliminates large swaths of bubbles that move to the other player's position.

When a player pops/drops more than 3 bubbles, the excess is added to the bubble bar as an additional bonus.

7 small bubbles in the bubble bar will merge into 1 large bubble.

Use the top 1 (big or small bubble) each time you use a bubble.

When you use a bubble on yourself (or a partner), it creates a defense effect, and you (or a partner) eliminate the corresponding bubble [ Bubble eliminates 1, Big Bubble eliminates 7].

When you use a bubble on a non-collaborator, it creates an attack effect that increases the opponent's bubble count by the appropriate number of bubbles [1 for small bubbles, 7 for large bubbles].

Whenever a certain number of bubbles are eliminated, a +1 attack will be applied to all opposing players.