Purple Sheep Wikia

The cake is the main goal of Purple Shep in Portal and a gift for Chell after completing the test. After Chell completed it, she had to get to the cake but GLaDOS said she was too late to get it and she became enemies with Chell for not even caring and she threatened to kill her. There was a hoax and rumour about the cake being a lie which said on the wall in the secret chamber in Test 16.