These are advanced tactics that can take many tries to master, but if they are done correctly, you can get a lot of mass.
Chase a person (example, you have 4,000 mass and that person has 2,000 mass) and get then close to a virus, then press space twice. The prey will eat your 4th part, then hit the virus due to growing, and your third part will eat everything. This does not always work, but if it works you usually get a lot of mass.
This is a very popular tactic in teams. Get a teammate, find a person that your teammate cannot eat with a single split. Split multiple times as your teammate splits to eat that person and the trick split is done. Be careful on doing this though, as an experienced player can easily reverse the tactic and they gain the mass instead of you.
So, this also requires a team-mate, but it's pretty simple and even a novice can do it. Split four times and make sure your team-mate cannot eat your slices. Wait for a person to come up and split just before they touch you, and watch as the teammate devours the victim, but do not do this on really big players as they can still devour the teammate.
This is pretty complex. Get you (or your teammate) to split once, and then find a victim. You then split and then the teammate splits multiple times into you (like the tricksplit) but this is really hard, as an experienced player can still kill you if your teammate mucks up or that they are very big.
This requires two teammates or more. For max effect, get four teammates, feed them around the same mass. (WARNING: DO NOT DO THIS IF YOUR MASS IS OVER 10000 AS YOU WILL SPLIT IF YOU HAVE 3 TEAMMATES OR MORE) Find a person and pretend you are AFK, then make the team-mate split to finish off the person.
This does not always work, but is similar to a pop split. Split twice when a person is just near a virus (on the side) and devour them.
Split at the smaller teamer at the RIGHT moment to gain the mass instead, or just be very big.
Try to make them think you don't care about them, and throw W in any direction, and then suddenly split on them. Another way is to simply be bigger than them or big enough to split and eat them
Same as tricksplit, have a very good timing.
Magic Cell Edit
Use the W to your advantage.
stay away from the virus or split once you see them wanting to pop you so THEY get popped instead of you