Josef Rusnak's The Thirteenth Floor, a sci-fi flick from 1999, was mistaken for a "Matrix rip-off" upon release. The film was based on the 1964 Daniel F. Galouye novel Simulacron-3 (aka Counterfeit World) and was also the basis for Rainer Werner Fassbinder's World on a Wire.
Read Frederik Pohl's Tunnel Under the World
Buy Daniel F. Galouye's Simulacron-3
Read Daniel F. Galouye's Spillthrough
Buy World on a Wire on DVD
Buy The Thirteenth Floor on DVD
Watch Craig Bierko in Illeana Douglas's Easy to Assemble
Bonus Interview with Michael Ballhaus
This is the alternate ending to The Thirteenth Floor.