Cameos
Pinkie Rabbit Land Game
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Throughout the game are references to Pinkie Rabbit, a cartoon Kyle admits he liked when he was a kid. This series-within-a-series is referenced a number of times throughout the Kyle Hyde and Another Code series, both developed by Cing.
It is possible to win a handheld Pinkie Rabbit game based on the Nintendo Game & Watch games, which were first released in 1980, the year this game is set.
You control Pinkie Rabbit who has to climb up and down ropes in order to collect carrots that hang from flying balloons at the top of the screen and return them to baskets at the bottom. Pinkie Rabbit has to avoid objects thrown by ninjas from the left and right, which includes hammers and pliers from the Game & Watch game Helmet.
In the Last Window Novel, Chapter 5 comments that Kyle won a "handheld gaming device from Japan released in 1980." It is also mentioned that Kyle used the game for a long while as a watch.
Kyle's Suits
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In the English translation, look in Kyle's wardrobe and check the suits that are hanging up. Kyle comments:
"I like suits. They're comfy and easy to wear."
This is a reference to a well-known comment made by a Youngster trainer in Pokémon Red & Blue:
"Hi! I like shorts! They're comfy and easy to wear!"
Lake Juliet
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One of the framed pictures shows a lake with a caption underneath it. If you try to read it, Kyle says:
"I can't quite read… Lake… Ju…et? Must be the name of the lake.
This is a reference to Lake Juliet, the setting for the Cing adventure game Another Code: R – A Journey Into Lost Memories.