I had a good time with this game, but in the end cannot recommend it to anyone besides historical reasons.
The overworld looks nice, but restricts the player's freedom maybe too much. The dungeon design is decent and reminds me of Lttp dungeons, but nothing super-creative here too.
Overall, after 20 years since it's initial release, this game feels like good, but very basic, bare-bones, typical ZC collect-the-triforce quest.

This quest is very enjoyable, the dungeon designs are excellent. And this quest really pushed the boundaries for an old ZC version.
You should remake this is 2.50. I could see a lot more potential in this!

I finished test playing LBDX for a Lets Play of it I'm starting today and I gotta say I'm totally looking forward to beating it again! TEH Z really kept my interest with every level, the music is awesome and dungeon designs are wicked. :3

Expect a PM when LBDX LP begins Z! xD

Easily in my top five favorite quests (maybe top 3? who knows? Music choices are fantastic, overworld is engaging and creative, dungeons each have their own unique gimmick and are designed wonderfully, and the tileset brings the game to stunning life.........andthe final boss.....damn, that final boss.....and this was made in 1.92.
Supreme effort shows everywhere in this gem, and I can tell it was polished and polished some more before it was released (random bugs aside). Amazing job, Mr. Z and hope you create another quest someday!

This quest was a very pleasant surprise. Going into 1.92 quests, you usually expect certain things as far as how dungeons are constructed, what kinds of enemies you're going to see late game, and even how the progression will work. Many of them are very formulaec. So, it's always nice to have one turn it completely on its head. Link's Birthday DX isn't really like any other ZC quest I've played, and that's a really good thing. It's definately inspired in design by Zelda, but in many ways it ends up being it's own entity. The central hub area in the sky is great, the dungeon design for the main dungeons is very well thought out and interesting (and never overstay their welcome), and the item progression makes sense and makes it so you never feel so overpowered that the game becomes entirely trivial. Also, the final boss was a very cool little moment that you really didn't see coming, and is probably my favorite custom boss I've seen from the 1.92 era. Overall, a fantastic quest that I would recommend to anyone.

Disabling the ability to see the world map by pressing the map button, which is the space bar by default, is a bad idea. The word "none" is misspelled as "noone" at every instance of the word, which is kind of annoying. There are quite a few other misspellings, for example "abandonned" instead of "abandoned". There's also a point of no return inside the first secret dungeon where you can get stuck and the only way to get out of it is to save and quit. You get stuck if you use the hookshot two screens north of the entrance without first pressing the switch on the same screen. When you take the underwater stairs in Level 6, the map is disabled until you change floors by going downstairs or upstairs.