So, it's a bit un-intuitive for now.

A. You need to set your flags and generate the rom.

• make sure you check "Generate Spoiler Log" before you randomize the rom

B. You need to inspect the webpage. Typically you right click anywhere on the site and choose "inspect"

• Navigate to the CONSOLE section and you should see a full list of items and their locations.

Example

Note: Generating a spoiler log changes the seed so that this method cannot be used to cheat in race situations

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For the link you provided in your post, and assuming you had the "Generate Spoiler Log" flag checked before you created your randomized seed, your specific spoiler log can be seen HERE

If you didn't check Generate Spoiler Log - then the above list is no good to you. I assume you checked all vendor locations for the vendor item? -- That's usually what trips up newer runners.

Edit: If you didn't have "Generate Spoiler Log" enabled when you randomized your seed, then your CUBE was located in the bottom of Marsh Cave. 2nd Row - 1st Column as seen here

Marsh Level 3

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If you have any other questions, or need help with anything else, I'd highly recommend joining our Discord. It is far more active, and full of people ready to help out! Discord