DROD / DROD:RPG -- an excellent and very complex series of puzzle games. I fell a little bit out of love with a series a while back because there are so many elements, allowing experienced designers to create extremely demanding puzzles, and it has the same problem as any puzzle game, the best designers are always the same ones who can and want to design hard levels, so in spite of the huge number of usermade holds, it's very tricky to find good quality medium-difficulty stuff. However, I recently got back into the series thanks to the prequel,
Gunthro and the Epic Blunder, which cuts down the number of elements used and is intended as a gateway to the series (both in difficulty and plot). DROD:RPG is a more mathematical spinoff (it's not actually an RPG) which I prefer to the main DROD series, but sadly there are far fewer usermade holds available for it at the moment.
Sonic (Genesis) games -- Recently I discovered soniccenter.org, a website where you can post your best times and number of rings for individual levels, and that's helped me get back into playing the Sonic games. My times are awful, but I really enjoy the puzzle aspect of finding a route to maximise the number of rings. They also have races every Saturday, rotating through all the numerous Sonic games, and I compete whenever one of the Genesis games comes up, and nearly always come last or second-last
Repton series -- Actually, I haven't been playing these much recently, as Richard (the head honcho of Superior Software) has shown no sign of putting in that extra bit of effort needed to get
Extravaganza finally released. I contributed well over a hundred levels for that, so it's hard to feel motivated at the moment. But I do have an ongoing project (five of seven parts done) to post a playthrough of
Repton 2: Caverns to my YouTube channel, so I should continue with that whenever I can.
Iji -- I also have a technically ongoing project to post a playthrough of a "perfect game" on
Iji, but I haven't touched this for a couple of years.
Final Fantasy IX -- I'm not actually playing this, but right now the guide for the "Excalibur II perfect game" challenge is nearing completion of its absolutely final revision. (One of the toughest "perfect game" challenges in any game, as the Excalibur II can only be got if you reach its location within 12 hours, so you have to fit
everything into that time limit.) I contributed to the development of the guide in its early stages, so I'm enjoying watching the final stages and some of the accompanying video runs, which are truly awesome in terms of how they manage to fit doing everything perfectly into the time constraint.