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Perfect collision

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ChaseCZCreated:
ChaseCZ#1
How do i make a perfect map collision/wall so the player/sprite can't walk through it?
MZ952#2
Draw a line between an entity's starting and finishing point, and determine if that line crosses any other suspected lines of collision. If so, you could for example: revert back to the starting point; revert to a point where the entity had not collided; reposition the finishing point to the surface of the thing it collided with.
JustGreat#3
Check for collision on several smaller steps each frame. If you've watched any Pannenkoek2012 videos, you should be familiar with how Mario moves in SM64. That's a decent example.