All costumes/sets/decades unlocked in Sandbox mode
Note: This procedure involves editing a registry
value; do not attempt this if you are not familiar with working with
your system registry, as a mistake can cause serious problems with
Windows. Start Regedit and use the "Registry/Export Registry File" menu
option to create a backup copy of your original registry.
Search for "Allow any Decade" with Regedit. Double click the "Allow any
Decade" entry and change the value data to "1". Start Sandbox mode to
have access to all decades and just about all of the sets, costumes,
props, etc.
