Challenge Act

Challenge Acts are Acts that appear in Sonic Generations. They are accessed via Challenge Act Gates in the area above each stage. There are five Act 1 (Classic Sonic) Challenge Acts and five Act 2 (Modern Sonic) Challenge Acts for each stage. Completing the first Challenge Act for any area unlocks a Boss Gate Key.

Act 1

 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * The Buzz Bombers' Revenge!: Beware of Buzz Bombers! Reach the goal before time runs out.
 * Knuckles: Horde of Enemies: A horde of enemies will try to interfere in your race with Knuckles.
 * Swingset Circus: Use swings to go up and up and reach the goal in the allotted time.
 * High Speed Challenge: Collect Power Sneakers to reach the goal before time runs out.

Act 2

 * Look Out Below!: Reach the goal before time runs out, but watch out for the crumbling course!
 * Tails: Way Past Fast: Race to the goal against Tails in his airplane.
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * Jump Rush: Master the Jump Panels as you bounce your way to the goal within the time limit.
 * 300% Boost Gauge Challenge: Your Boost Gauge is tripled. Reach the goal to earn the Boost Gauge Up Skill!

Act 1

 * Tails: Toxic Skies: Press Triangle/Y to grab Tails' hands to fly and reach the goal within the time limit.
 * Which Switch is Which?: Flip the various Switches and make your way to the goal within the time limit.
 * Aqua Shield Challenge: Use Aqua Shield to reach the goal in time and obtain the Aqua Shield Skill!
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * Invincibility Challenge: Get the Invincible power-up to get past hordes of enemies and reach the goal in time.

Act 2

 * One Ring Challenge: Reach the goal in time with only one Ring!
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * Amy: Taking the Leap Together!: Press Triangle/Y to call Amy for a super-high jump to get to the goal in time.
 * Grappling with Grabbers: Avoid the Grabbers' immobilizing grasp and get to the goal in time.
 * Underwater Ring Machine: Collect a set number of Rings scattered by the Sprinkler enemy and reach the goal in time.

Act 1

 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * Eggrobo Rush: Reach the goal in time while fending off a bevy of menacing Eggrobos!
 * Aerial Paradise: Use Warp Points to make your way to the goal in the allotted time.
 * Ring Time Challenge: Use Ring Time Triangle/Y to get a set number of Rings and reach the goal in time to earn the Ring Time Skill!
 * Amy: Topsy-Turvy: Race against Amy while riding on a spinning top and beat her to the goal.

Act 2

 * Knuckles: Buried Treasure: Press Triangle/Y to make Knuckles dig up Medals! Collect a set number and reach the goal in time!
 * 200% Boost Gauge Challenge: Your Boost Gauge is doubled. Use the Boost Gauge to reach the goal in time.
 * Balloon Bonanza: Use balloons to bounce extra high as you make your way to the goal in time.
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * High-Speed Hijinks: Enemies move and shoot at double speed. Get to the goal in time!

Act 1

 * Cream: Chao Hunt: Compete with Cream to find more Chao than her and reach the goal.
 * Hot Pursuit: Avoid getting hit by the pursuing enemies and get to the goal in time.
 * High Speed Challenge 2: Collect Power Sneakers to reach the goal before time runs out.
 * Resisting Arrest: Beware of Cop Speeders! Reach the goal before time runs out.
 * Doppelganger Race!: Face of against Sonic's double and beat him in a race to the goal.

Act 2

 * Overdrift: Grab as many Rings as you can while drifting and get to goal in time.
 * Hot Pursuit: Chase the Sprinkler enemy that's dropping Rings. Collect a set number and reach the goal in time!
 * Doppelganger Race!: Face of against Sonic's double and beat him in a race to the goal.
 * Drill Baby Drill: Smash your way through boxes as you descend to the goal before time runs out.
 * Espio: Master of Camouflage: Only the searchlight can reveal Espio. Face him and get to goal in time.

Act 1

 * Lord of the Board: Show off your skateboard skills while racing to the goal before time runs out.
 * Thunder Shield Challenge: Use the Thunder Shield to reach the goal in time and obtain the Thunder Shield Skill.
 * Rouge: The Bombardier: Watch out for bombs Rouge drops and get to the goal in time.
 * Doppelganger Race!: Face of against Sonic's double and beat him in a race to the goal.
 * Rite of Spring: Springs everywhere! Use them to bounce your way to the goal in time.

Act 2

 * Cream: Helping Hand: The only Rings are the ones Cream drops for you. Get to the goal in time.
 * Dash Ring 1-2-3: Pass through Dash Rings in order and reach the goal before time runs out.
 * Topsy-Turvy: Use the Horizontal Bars and Spinning Platforms to reach the goal before time runs out.
 * High-Speed Hijinks 2: Enemies move and shoot at double speed. Try to get to the goal in time!
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.

Act 1

 * Rescue the Animals!: Save a set number of captured animals from Capsules and reach the goal in time.
 * Doppelganger Race!: Face of against Sonic's double and beat him in a race to the goal.
 * Espio: Way of the Ninja: Press Triangle/Y to have Espio attach a rope to the hooks and reach the goal in time.
 * High-Speed Hijinks: Enemies move and shoot at double speed. Try to get to the goal in time!
 * Underwater Challenge: Keep an watchful eye on the underwater terrain and get to the goal in time.

Act 2

 * Rouge: The Temptress: Press Triangle/Y to have Rouge take out enemies using her wiles and reach the goal in time.
 * Doppelganger Race!: Face of against Sonic's double and beat him in a race to the goal.
 * Trick Island: Use Rainbow Rings to pull off enough tricks and reach the goal in time.
 * Surf, Sea and Sand: Take on various course and find your way to the goal before time runs out.
 * Terror From the Deep: Skim the water's surface and try not to get chomped by a giant Chopper. Get to the goal in time!

Act 1

 * Doppleganger Race: Face off against Sonic's double and beat him in a race to the Goal.
 * Goal Post Juggle: Don't let the Goal Post hit the ground as you get to the Goal in time.
 * Vector: Through the Storm: Call for Vector with Y/Triangle to get by spots you can't pass and reach the Goal in time.
 * Flame Shield Challenge: Use Flame Shield to reach the Goal in time and obtain the Flame Shield Skill.
 * Ring Time Challenge 2: Use Ring Time Y/Triangle and reach the Goal in time to get the Ring Time Skill.

Act 2

 * Power Stomp Challenge: Use your Stomping skills to reach the Goal before time runs out and unlock the Power Stomp Skill.
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the Goal.
 * Switcheroo: Put your brain to the test by hitting switches to get to the Goal in time.
 * Blaze: Piercing the Flames: Call Blaze Y/Triangle to get through the flames and get to the Goal in time.
 * Four-way Cannon Cavalcade: Go from one Four-way Cannon to another and get to the Goal before time runs out.

Act 1

 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the Goal.
 * High-Rise Balloon Climb: Use the Big Balloons to climb higher and higher and reach the Goal in time.
 * Dash Ring 1-2-3: Pass through all Dash Rings in order and reach the Goal before time runs out.
 * Charmy: Don't Bug Me!: Watch out for Charmy! Reach the Goal in time while avoiding Charmy.
 * One Ring Challenge 2: reach the Goal in time with only one Ring.

Act 2

 * Barrel Ring Bonus: Smash open barrels to get the Rings inside and grab a set number before time runs out.
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the Goal.
 * Rooftop Rail Grind: Go boarding across the rooftops and clear the stage in time.
 * Endless Boost: Boost to the Goal before time runs out to earn the Endless Boost Skill.
 * Vector: Pick Up the Beat: Pass notes back and forth with Vector until the croc misses the beat.

Act 1

 * With Your Powers Combined: Use the Aqua, Thunder and Flame Shields to get to the Goal in time.
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the Goal.
 * Goal Post Juggle 2: Don't let the Goal Post hit the ground as you get to the Goal in time.
 * Chase After Blaze: Try to catch Blaze before time runs out, but watch out for the bombs.
 * Rescue the Animals 2!: Save a set number of captured animals from Capsules while avoiding bombs dropped by Sprinklers and reach the Goal in time.

Act 2

 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the Goal.
 * Cart Challenge: Ride the Cart and get to the Goal safely in time.
 * Charmy: High in the Sky: Press Y/Triangle to call Charmy to create a path so you can reach the Goal in time.
 * Action Master: Wall Jump, Stomp, and Lightspeed Dash your way to the Goal before time runs out.
 * Orange Rocket, Blast Off!: Use the Orange Wisp to turn into the Orange Rocket and reach the Goal in time.