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* The cake slice icon shown on the neon panels throughout [[Test Chamber]]s in Portal appears in another Valve game, [http://store.steampowered.com/app/630 Alien Swarm], as the icon of the achievement "Perfect". | * The cake slice icon shown on the neon panels throughout [[Test Chamber]]s in Portal appears in another Valve game, [http://store.steampowered.com/app/630 Alien Swarm], as the icon of the achievement "Perfect". | ||
** The icon has also appeared on the [http://wiki.teamfortress.com/wiki/Noise_Maker#Team_Fortress_Birthday TF Birthday Noise Maker] item's icon in ''Team Fortress 2'', with the cherry removed. | ** The icon has also appeared on the [http://wiki.teamfortress.com/wiki/Noise_Maker#Team_Fortress_Birthday TF Birthday Noise Maker] item's icon in ''Team Fortress 2'', with the cherry removed. | ||
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