Of all time? Hmmm ok.
Master of Orion 2 - Totally amazing 4X space based game. This game would be praised by many if it was released by an indie today. It tolds up well today, though it's an approx 20 year old game. Had so much fun playing this game and learning about it as almost everything in the game is right clickable to get info about it.
Note Well - The 3rd and 4th games on this series are garbage.
Secret of Monkey Island 2: LeChuck's Revenge - My favourite point and click adventure game. One of the first I have ever played and still my favourite one after playing so many. Lots of humour and it really makes you think.
The new Monkey Island and Back To The Future (in 5 parts) games are good for modern ponit and click games too.
Quell Momento - Simple fun casual game with an amazing soundtrack and a great story. The story is not told all that well, but the music and gameplay are great. The other 3 games in the series (Quell, Quell Reflections and Quell Zen) are similar and just as good.
Super Mario Galaxy 1/2 - Best Wii game in my opinion. Sure technically it's 2 games but Nintendo only turned the 2nd from a expansion pack into a new game after they realised how much content they had for part 2. It's just wow. Today as well as back then.
Terranigma - My favourite SNES game. The last game Enix made before the Squaresoft / Enix Co merger. It's a real time RPG. Think like Zelda SNES or Illusion of Time/Gaia but way better. Only released in Japan/Europe and Australia. For many emulating it with the rom is the best way to play it. And you should. The story totally made me feel sad at the end, in a good way. A really good game. The game is actually based on Earth too. You can visit all the continents in the game.
To The Moon - This is more of an interavtive story than a game. But totally worth playing. The story here is amazing. I can't talk about because spoilers really ruin the game as the unexpected turns the story has are the main reason to play the game. If you like great stories this is a must.
Xenoblade Chronicles X - Massive open world RPG. Think Breath of the Wild large. I really hope this is ported to the Nintendo Switch. If nothing is said at E3, I'll go back and play this on the WiiU. Not much to dislike here. I was not really a fan of the Wii game but the WiiU game totally hooked me.
Zelda: Breath of the Wild - Probably my favourite Zelda game. How do I know this? 110 hours in and still not touched any of the 5 main dungeons and I still want to keep playing the game. A game that is as fresh at the 100 hour mark as it is at hour zero, that's prety huge. The game is really as good as all the reviews say.
Starcraft and Broodwars - I probably have played the Diablo games more but Starcraft and Broodwars really are great games. At the time I really like them. They hold up really well and the story is way better than the Starcraft 2. I also think the multiplayer balance is better in Brood Wars than SC2.
Note Well: Starcraft and Broodwars are being remastered so get that when it's out so you can play these in modern OS's with decent resolutions and updated graphics, sounds and voices.
Hearthstone - Probably the best digital card game ever. It's just really fun. I've played way too much of it.
I know this is ten and not Five but I can't narrow down the list anymore.
I'm just disappointed by the lack of traditional Zelda dungeons in BOTW. The two "dungeon" bosses I completed so far offered no challenge. The regular enemies are more challenging than the bosses. It is still an epic adventure.
That's the whole point, you play it and after a while you realise, oh wow I have 50+ hours into it. You don't feel like you love it while you play it but you're so engrossed that nothing else matters but this game. I've done 110 hours so far into the game and not touched any of the 5 main dungeons in the game. Any game that does this is totally worthy of it's scores.