The sandcastle warning — "If you do this your name will be erased from leaderboards" — is a developer deterrent, not a literal system ban.
Background
Original N64 "Stop 'n' Swop": Rare planned to transfer data between Banjo-Kazooie and Banjo-Tooie via cartridge hot-swap. Cut due to hardware instability.
XBLA Port (2008): 4J Games implemented a software simulation of Stop 'n' Swop. Entering the old N64 codes (via sandcastle floor) unlocks Stop 'n' Swop items (ice key, pink eggs) in BK and corresponding rewards in BT (if both owned).
Why the Threat?
Leaderboard integrity: Stop 'n' Swop items give gameplay advantages (extra health, eggs, feathers). Using them to set high scores on Xbox Live Leaderboards would be cheating.
Deterrent text: The warning scares players into playing "clean" for leaderboard eligibility.
Actual enforcement: 4J Games / Microsoft never automated leaderboard wipes for code entry. The leaderboards were never that actively curated.
Reality
Entering codes unlocks items in your save. You can use them in gameplay.
If you then post a score to the leaderboard, it might be flagged if someone reports you, but no auto-wipe exists.
Leaderboards are long dead (Xbox 360 Live stats deprecated). No one cares.
Verdict: Enter the codes. Enjoy the cut content. The warning is a paper tiger from 2008.
