levelSeed = 1234 // starting seed
distanceTraveled = 100 // keep track of this every frame

// update this prior to adding a new section, obstacle, enemy, etc
// each time the distance is different
rand.setSeed(levelSeed + distanceTravelled)

// example of picking a new trackSegment, after updating the seed value
trackSegment = trackTiles[rand.getInt(numTrackTiles)]