Arsenal Pyramid (アーセナルピラミッド Āsenarupiramiddo?) is the seventh stage in Sonic Forces, and the first stage in the game to use the Tag Team gameplay style. This stage is a re-imagination of the Green Hill Zone from the original Sonic the Hedgehog for the Sega Mega Drive.
Arsenal Pyramid is set around and inside a Dr. Eggman weapon factory in Green Hill. Despite being located in Green Hill, however, the area has become dry and sandy due to the heavy desertification caused by Eggman's industries. During the events of the game, the Arsenal Pyramid was attacked by Sonic the Hedgehog and the Avatar on behalf of the Resistance.
Arsenal Pyramid is a weapon factory that pumps out munitions that Dr. Eggman uses for his war efforts. The stage starts out in the dried-out part of Green Hill. Like before, the lake areas and waterfalls in Green Hill have been replaced with streams of sands and deserts. However, the location's signature blocky brown mountains are still presents. Most prominent in this region however, are the large mechanized pyramids that can be seen far and wide. These pyramids have pipes attached to them at the bottom.
Many remains of the Green Hill roads are still prominent in the beginning of this stage (although the flora and checker-patterned soil are all dried up). However, these features steady fade away until they are replaced with over-dimensioned pipes, large metallic scaffolds, frameworks, and artificial roads. As the player gets closer to the main pyramid in this stage, they will discover storage areas for neatly-stacked shipping containers, tube systems and metallic structures in the open desert surrounding the pyramid.
The main pyramid has a bridge on the side, leading to a vent shaft on the top. Inside it is a metallic factory full of Eggman robots and massive spinning gears. Also, in the center of the pyramid are conveyor belts that carry around the large shells that the factory produces.
While Eggman is hard at work in the Arsenal Pyramid, the Phantom Ruby shows up at his doorstep. Finding the Ruby and discovering its unique properties, Eggman proceeds to study this interesting gem, only for the Jackal Squad to show up to raid his base. During the following confrontation between Eggman's forces and the invaders, the captain of the Jackal Squad touches the Phantom Ruby and is shown his ideal world: a desolated land. Having seen this as well, Eggman offers the captain the chance to join his cause, which he happily accepts.
E-123 Omega would later infiltrate the base as part of a reconnaissance mission. However, much to Rouge the Bat's chagrin, Omega has an extremely loose definition for "recon" and "infiltration", as he proceeds to conduct wanton slaughter of several Badniks. This ultimately results in Orbot and Eggman noticing the attack, and Eggman deducing that he has an opportunity to test out Infinite's powers due to Omega going in alone. Infinite proceeds to confront Omega, and, after noting his spiritedness, defeats Omega in a flash. Shadow then arrives to investigate Omega's last whereabouts.
Much later, Sonic and the Avatar arrive, running towards the pyramid-shaped factory to attack it and open up a path for the Resistance after learning that the pyramid had to go if the Resistance is to stand any chance of attacking Metropolis without Eggman being able to supply his warmongering effort further with additional munitions. Knuckles suggests sending reinforcements, but Sonic replies that he and the Avatar can handle it. With directions from Amy, Sonic and the Avatar infiltrate the factory and fight the Badniks, eventually reaching their goal, allowing the Arsenal Pyramid to be destroyed and cut off Eggman's source of ordnance for his war effort.
Arsenal Pyramid is an overall linear road, but with multiple path options inside the factory to make travel down the path faster, depending on what tools the player have at their disposal.
Like in other Tag stages, the player controls both Sonic the Hedgehog and the Avatar at the same time here, with the lead character switching to Sonic when Boosting and to the Avatar when using the Wispon. To accommodate the different characters, the stage has mechanics for both of them. For Sonic, the stage has Wisp Capsules with White Wisps along the way so the player can charge their Boost Gauge. For the Avatar, the stage has Wire Targets for the player to swing around on using the Wire Attack, and Wisp Capsules with miscellaneous Wisps for fueling the Avatar's different Wispons. However, any Wisp Capsule containing Wisps that do not match any of the Wispons the player has currently obtained will be rendered intangible and transparent until the player obtains their Wisp's associated Wispon. This means, for example, that if the player does not have a Lightning Wispon, then the capsules with Ivory Wisps will be unobtainable.
The stage begins with the player running down a road through the Green Hill area until a set of Springs sends them flying towards a metal scaffold in the sand. While in midair, the player can use Sonic or the Avatar to reach higher or lower paths on the route ahead. Further down this route, the player will be launched towards the road leading to the main pyramid by a Ramp. Upon reaching the Star Post, the player is then prompted to activate the Double Boost, which will allow them to boost through enemies and obstacles while they run to the top of the pyramid.
Once at the top of the pyramid, Sonic and the Avatar will jump into the vent up there. They will then descend down a shaft filled with laser field-like grids. Once at the bottom of the shaft, the player must proceed forward on the path, towards the room with the gear platforms so large that the player can walk and fight on them. On these platforms, the player will be ambushed by Egg Pawns. Taking out these enemies will lower the nearby gear platforms, thus allowing the player to proceed. Alternatively, the player can use their Lightning Wispon's special action and Wire Attack abilities to simply travel through midair and skip the platform battles. At the end of the gear platform section, the player must then run along a path with sharp turns that the Avatar handles. At the end of this path, some Springs will then launch the player towards a metal bridge with the goal at the end.
|"Arsenal Pyramid"||Tomoya Ohtani||2:43|
|"Arsenal Pyramid - Interior"||Tomoya Ohtani||2:36|
- Sonic Team (November 7, 2017). Sonic Forces. Nintendo Switch. Area/Level: World Map. "Knuckles: And here's is the bad news. Out intel indicates Eggman's got a weapon factory in Green, pumping out munitions for his war efforts."
- Sonic Forces: Rise of Infinite, "Rise of Infinite"
- Sonic Forces: Looming Shadow, "Looming Shadow"