The ancient water creature, Chaos, makes a return as a boss in Sonic Forces, and you'll face him as Classic Sonic. This battle is a classic 2D platforming challenge, requiring precise jumps, momentum management, and an understanding of Chaos's water-based attacks. The arena is a series of floating platforms over a dangerous water pool, adding an environmental hazard to the fight.

Phase 1: Water Tentacles & Projectiles
- Attacks: Chaos will emerge from the water, attacking with large water tentacles and firing water projectiles. He may also create small water geysers on platforms.
- Strategy:
- Dodge Tentacles: Jump over or run under his sweeping water tentacles.
- Avoid Projectiles: Use your speed and jumps to dodge the water projectiles.
- Spin Dash to Attack: When Chaos is fully exposed on a platform, use a Spin Dash to hit him. You'll need to hit him multiple times.
- Platforming: Carefully navigate the platforms, as falling into the water will cause damage.
- Vulnerability: After he completes a tentacle sweep or projectile attack, he'll often be briefly exposed on a platform.
Phase 2: Water Surges & Larger Attacks
- Attacks: As his health depletes, Chaos will become more aggressive, creating larger water surges that cover entire sections of the arena and launching more complex projectile patterns.
- Strategy:
- Anticipate Surges: Watch for visual cues that indicate an incoming water surge. Get to higher ground or a safe platform quickly.
- Precise Jumps: The platforming becomes more demanding. Time your jumps carefully to avoid both Chaos's attacks and the environmental hazards.
- Spin Dash Openings: Continue to look for openings after his attacks to land Spin Dashes.
- Vulnerability: Similar to Phase 1, but the windows of opportunity might be shorter or require more precise timing.
Chaos is a test of your Classic Sonic platforming skills. Focus on dodging his attacks, maintaining your momentum, and striking when he's vulnerable. Keep a high ring count for protection, as the water can be unforgiving. Patience and observation of his attack patterns are key to victory against this watery foe.