When they later returned, they found the white Chaos Emerald in Casinopolis, only to lose it to Robotnik when he ambushed them with some sleeping gas. After they both met, the two of them went to the Mystic Ruins. Spotting Tails' crash landing, Sonic went to help him. The next day, many new people appeared in Station Square Knuckles had come in search of the Master Emerald's shards, some of which he eventually found in Speed Highway and Casinopolis Big came to the city looking for Froggy, whom he would search for in the city's sewers and Twinkle Park and Tails crashed his new biplane in Emerald Coast. Robotnik from one of the nearby rooftops. Unbeknownst to Sonic however, his clash had been observed by Dr. Fortunately, Sonic came to the rescue and defeated Chaos, who escaped into the city's sewers. The Station Square Police Department tried to stop Chaos, but their weapons proved ineffective against the creature. In Sonic Adventure, Sonic arrived in Station Square, just as Chaos attacked City Hall. Sonic in Station Square, from Sonic Adventure DX: Director's Cut. See also: Station Square (Sonic Adventure)
