When using the Gray Quake, the user transforms into a gray iron ball with yellow eyes. In Sonic's case, his entire body turns into a gray rhombicuboctahedron which only shows his eyes, albeit without pupils and colored pale yellow, which take up two squares on the surface and are connected by a small string.
Sonic Lost World
The Gray Quake made its first appearance in Sonic Lost World. In the Wii U version, it is only usable in Two-Player-Race Mode, where it stuns the opponent for a few seconds when used. In the Nintendo 3DS version, it can first be used in Silent Forest Zone 1. In gameplay, using the Gray Quake turns Sonic into an iron ball that moves forward automatically: He can also both plow through gray-checkered walls and damage enemies upon touch, though Sonic can still take damage from obstacles such as iron balls. It can also damage all surrounding enemies and obstacles (including airborne ones) by slamming the ground, cross quicksand and green sludge without losing speed, and climb straight up walls by rolling into them.
To use the Gray Quake in gameplay in in the Nintendo 3DS version, the player must tap the icon of the Gray Wisp on the touchscreen while in possession of a Gray Wisp. If the player is in an area not suited for the Gray Quake however, the Gray Wisp will go dormant (which is illustrated by its on-screen icon sleeping), thus preventing the player from becoming the Gray Quake. Once transformed into the Gray Quake, the player's Wisp Gauge starts to deplete, and once it runs out, the user will revert back to normal. To extend its duration, the player has to collect more Gray Wisps. The player can also touch the Sonic icon on the touchscreen to transform back to normal, though at the cost of losing the Gray Quake. To move left and right with the Gray Quake, the player has to tilt the Nintendo 3DS to change direction. The player can also press / to jump and / during a jump to slam into the ground and damage all surrounding enemies and obstacles.
Team Sonic Racing
In Team Sonic Racing, the Gray Quake makes an appearance as a product of the Gray WispItem Box power-ups that can be obtained on the race tracks. In this game, rather than transforming the playable character when using the Gray Quake, the game manifests the Gray Quake's power for the playable character to use.
To use the Gray Quake in gameplay, the player has to press // while in possession of a Gray Wisp. Once activated, the player releases the Gray Wisp, who will fly ahead of all the competitors on the race track. Eventually, it will stop a set distance ahead of the leading racer. Shortly thereafter, several stone pillars will emerge from the ground on the road. These stone pillars will damage any racers who collide with them, except for the user and their teammates. It is also possible to bypass or otherwise destroy these stone pillars with Wisp power-ups, Invincibility or the Team Ultimate. Otherwise, avoiding the stone pillars is a daunting but possible task. Also, activating the Gray Quake can change the pace of the race at once.
Powers and abilities
As the Gray Quake, the user's body density is greatly increased, making them so heavy that jumping or falling down on the ground can create destructive shockwaves across the area that are powerful enough to tear apart robots and break down the environment. The Gray Quake also possesses wall-crawling abilities, allowing the user to scale walls despite their weight in this form.
The main drawback of the Gray Quake is that it makes it harder for the user to move around. Additionally, it can only be used for a few seconds and requires more Hyper-go-on from Gray Wisps to be maintained.