Each of the times tables from 3 through to 9 are represented by different pictures which appear along the train track in order. The journey can then be recalled at any time as it will be familiar and then decoded from the pictures to numbers almost instantly with practice.
Times table memory palace using the ROBLOX game platform for kids.
Feel free to give it a try and let me know what you think, it's totally free and can be played with a standard ROBLOX guest account (no sign-up required)
https://www.roblox.com/games/231582208/view?rbxp=81624918