Arcade game developers craft high-viral and word-of-mouth games by focusing on addictive gameplay, simplicity, and social engagement. Key strategies include:

1. Simple yet Addictive Mechanics: Games like "Flappy Bird" succeed with easy-to-learn, hard-to-master mechanics that keep players hooked.

2. Social Sharing Integration: Features like leaderboards, challenges, and shareable achievements encourage players to invite friends, boosting organic reach.

3. Emotional Triggers: Games that evoke excitement, competition, or nostalgia (e.g., retro pixel art) create memorable experiences worth sharing.

4. Quick Play Sessions: Short, rewarding sessions fit busy lifestyles, making players more likely to return and recommend the game.

5. Community Building: Developers foster communities through updates, events, and user-generated content, sustaining long-term engagement.

By blending these elements, arcade games can achieve viral success and dominate word-of-mouth conversations.