Invisible Solid Barrier - RetroKoH/S1Fixed GitHub Wiki

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The Invisible Solid Barrier is an object in Sonic the Hedgehog, appearing in Marble Zone. It is an invisible object spanning across a designated rectangular space based on its subtype, similar to the Lava Tag. This object is placed over portions of the foreground that require additional solidity-related properties. These objects allow Sonic to be crushed by ceilings, and pushed out of walls while standing still on moving objects. Without this object, both of these functions would be impossible without an extensive rework of the solidity detection system.