This is a mod made by a Korean mapper. The read me is almost empty. It seems to be a remake of Half-Life! It starts with a tram ride, followed by collecting your hazard suit, then pushing the material into the test chamber and watch things go wrong.
This review may contain spoilers
Half-Life: Residual Point is Expansion Pack type of mod, where you play as one of "Clean Suit" scientists. Once you start it up, you get begin the game either by choosing Training or choosing the difficulty setting. Both modes has different storylines and gameplay.
The "Training" mode plays in the very similar way to the original game - you start in the tram, then you get in your suit and procceed to the experiment, which involves you pushing the sample. This part is what makes it a non-canon mod, because we all know what caused the Ressonance Cascade. After the experiment fails, you have to take one of the two portals, offering you different paths to complete the game.
The "Classic" mode is a bit different and more lore friendly. After getting in the suit, you are about to be teleported to the location where your work has to begin, but things goes wrong and Xen creatures starts teleporting into facility. Your goal is to escape the facility while also solving various puzzles and choosing different patches to complete the game.
The level design is great, but not everywhere. Quite alot of places are copies of the existing levels from Half-Life, Blue Shift and Opposing Force, which can be really irritating at times. The custom made areas are alot better! While it does not give you any new weapons, it features a few new enemies - Fast Headcrabs, Stronger Vortigaunts, Baby Ichthyosaurs, zombified, but still capable of using weapons, H.E.C.U. soldiers and a new models of Black Ops. Each of the modes takes 3-7 hours to complete depending on difficuty, style of playing and the paths you'd taken. It is a must play for any Half-Life fan!