Spider-Man: Edge of Time Nintendo DS Cheats and Tips

Stay near the eggs and when Anti Venom charges,use your accelerated decoy and Anti Venom will smash the egg,creating a quantum causality that will eliminate the experiments in 2099.Repeat the process to the on the other eggs except for the one in the left corner.When all the eggs are destroyed,spider man will be safe and you can continue fighting Anti Venom.

The rift is a mutation between rhino, Dr.Octavious, and the other guy who was sucked in the portal. The beast is called atrocity. You can defeat it by hitting it's arms when it goes through the portals it creates.

I did it by mashing buttons but can't do it again

Here is a few other cheats if you are interested:

1.right down down up left down down right (Big Time Costume is unlocked)
2.Up, Down, Left, Up, Down, Left, Right, Left (Unlock Future Foundation Costume (Amazing))
3.innerspider (What If? The Other Costume)
4.laststand (Last Spider-Man Suide)
5.coldhearted (Unlock What If?: Russia Costume)
6.twospidersenter (Unlocks Arena Mode for Amazing and 2099)

But if you want to beat the Black Cat I suggest you:

1.Use your Spidey sense to locate the door that is unlocked with the key you just obtained. A couple of tentacles will block your way into the sewers, but their ends are nearby, so blast them to gain access into the sewer tunnels. Drop down into the hole and then swing through the sewers, avoiding the tentacles as much as possible, shooting the ones with web that you need to, until you reach the other side. Don't touch the ground because you will take damage.

2.When you reach a dead-end, start crawling up the wall. Tentacles will appear to block your path, so wait for them to disappear before you continue crawling upwards. When you reach the top, go through the door and then swing over more of the evil sewer gunk to reach the next area. It'd be wise to try to swing into the orbs so you can upgrade Spidey, you know.

3.When you reach solid ground, all the paths except the way you came and the way you have to go will be completely blocked off by tentacles. Head down the unbeaten path while avoiding the flailing tentacles that are sticking out of the walls and blasting the other ones that are blocking your path in the face as need be. Keep pushing through and you will end up back in the egg room.

4.Tentacles will be blocking your way to the time machine dealy. There will also be two tentacles on the right side of the room (facing the exit), and behind them is the tentacle that you need to web. Do this. They will all retract, but DON'T approach the door just yet; you will get glitched uner the new tentacles and die automatically if you do so (trust me...I found this out the hard way).

5.Wait for more tentacles to pop up. This time they're on the left side. Blast the necessary tentacle, then wait around again. Another tentacle will burst through the floor and block the door. Do a 180 and then blast away the tentacle behind you. You'll finally be able to return to the time machine! Hip hip!... Horray!!!

This answer is over a year late but someone might need it like I did. So you change time periods by pressing select