51. Warcraft III: The Frozen Throne - PC
52. Starflight - PC
53. Skies of Arcadia - Dreamcast
54. Aliens versus Predator Classic 2000 - PC
55. Super Star Wars - SNES
56. Shadowrun: Hong Kong - PC
57. Hexen: Deathkings of the Dark Citadel - PC
58. The Catacomb - PC
59. Azure Striker Gunvolt - 3DS
60. Mighty Gunvolt - 3DS
61. Catacomb Abyss - PC
62. Monkey Island 2: LeChuck's Revenge - PC
63. Strike Suit Zero - Director's Cut - PC
64. Wolfenstein 3D Spear of Destiny - PC
65. StarCraft - PC
Another game I've owned forever but never legitimately beat until now. It helps that these days I understand the economic theory of RTS's and so know how to maximize my unit production.
Oh man, the pathfinding is SO BAD. It was frustrating back in the day, but we didn't realize just how bad it was until we got some good pathfinding like in modern RTS's. I actually found myself not using certain units when possible because I didn't want to deal with their pathing. But aside from that the general mechanics still hold up really well. There's a good spread of units that all have a use at one point or another. Some missions definitely guide you towards one unit or another, but otherwise use what you like.
Something that's interesting now that I look back on it is that your opponents across the campaigns are rather unbalanced. The Terran campaign ends up having Terrans as the primary enemy. Out of the nine non-installation missions two are tutorials that are technically against the Zerg, but I don't count those. So of the seven left you fight two against the Zerg, one against the Protoss, and four against the Terrans. It ends up making your Firebats and Vultures pretty meh, through the campaign, which is unfortunate. And there's one mission you can finish in a minute because Defensive Matrix is hilariously OP.
The Zerg campaign has a better spread. You have three missions against Terrans, four against the Protoss, and a single one against the Zerg (and that's only because they go crazy due to Zasz dying). The Protoss campaign is seven against the Zerg and two against the Protoss; you don't even fight the Terrans aside from a triggered event in one mission that sends a squadron of Wraiths and a Battlecruiser against you. It all makes sense in the context of the story, but from the perspective of training you to go out and do multiplayer it's pretty terrible.
I don't think I'm going to take on Brood War just yet. As I recall the Brood War campaign is overall harder and the final mission is essentially a reverse of the final original campaign mission. In the original campaign the final mission is you with two bases surrounding the Zerg in the middle (which lets you build up a satisfying giant attack force and pincer them for ultimate victory). The last Zerg mission of Brood War has you as the Zerg base in the middle surrounded by three enemy bases. I'm sure it's doable, I just don't have the energy for it.