Moving to Tokyo is a huge move, so congrats! Honestly, skip the games if you just need survival Japanese. You dont need fancy flashcards; you need speaking practice to get comfortable with the sounds. Apps that force you to just match pictures wont help when you are standing in front of a train station. Check these out if you want to actually talk:

• ChatGPT Plus Subscription is surprisingly good if you use the voice mode. You can tell it to act like a waiter or a train conductor and just talk to it. It is 20 bucks a month but you get way more than just language help.
• Talkpal AI Language Learning has a solid free tier and is cheaper than most. It uses AI to simulate real conversations, which is exactly what you need for ordering food.
• Pimsleur Japanese Subscription is not strictly AI, but it is the gold standard for speaking. It focuses entirely on audio and listening, which is way better for survival skills than reading characters you wont recognize yet. Honestly, just commit 20 minutes every single day. If you find a partner to talk with, you will survive the trains just fine. Its gonna be stressful at first, but you'll pick up the survival basics quick if you stop clicking buttons and start speaking out loud. Good luck with the move...

Honestly, if you are moving to Tokyo in three months, you need to stop messing around with gamified apps immediately. Most of those are just glorified memory tests. If you want to actually speak, you need to get comfortable with the grammar structures right away. Check out Anki AnkiDroid Flashcards because you can download pre-made decks for survival Japanese phrases. It is free and honestly the best way to get vocabulary into your brain so you aren't completely lost when you arrive. For the speaking side, look into ChatGPT Plus Subscription if you have the spare cash. You can use the voice mode to just practice back-and-forth conversations in Japanese. It will correct your pronunciation if you mess up, which is way more useful than clicking pictures of apples. Just be careful though, AI can sometimes get the politeness levels wrong, and in Japan, that matters. Keep it simple and focus on basic polite forms. Also, make sure you grab a good pair of headphones like Sony WH-1000XM5 Wireless Noise Canceling Headphones so you can actually hear the nuances in the language while you are practicing on the go. Dont stress too much about being perfect, just get used to the sound of your own voice saying the phrases. Three months is tight but you can definitely get the basics down if you stay consistent.

Regarding what #2 said about ignoring games, they're spot on. I tried Rosetta Stone Japanese Level 1-5 years ago and honestly, it was way too expensive for what it offered. I felt pretty let down by the lack of real conversation. If you need cheap, get Tandem Language Exchange Premium instead. It lets you actually talk to locals for free, which is the only way to not panic when you land at Narita.