Arcade game developers employ several strategies to ensure balanced difficulty curves in progressive games, keeping players engaged without frustration. First, they use playtesting extensively to gather feedback on difficulty spikes and adjust levels accordingly. Data analytics help track player progress, identifying where players struggle or lose interest. Developers often implement dynamic difficulty adjustment (DDA), where the game adapts based on player performance. Additionally, gradual introduction of mechanics and incremental challenges ensures a smooth learning curve. Finally, careful pacing and reward systems maintain motivation, balancing challenge with a sense of achievement. These techniques create an enjoyable and immersive experience for players of all skill levels.