Hey guys, welcome back to part four of my Unreal Engine 5.1 Endless Runner tutorial series. In this video I focus on two big gameplay upgrades: smooth lane switching and gradual speed increase while the character runs. First, I set up clean input actions by duplicating my input mapping assets, creating Left_IA and Right_IA, and wiring them inside IMC_RunnerDefault to the A and D keys. Then inside BP_RunnerCharacter, I build a simple but solid “Change Lanes” system using an integer lane index, clamping it between 0 and 2, and moving the character on the Y axis. For the actual movement, I use a Timeline called “Transition” (0.2 seconds) and a Lerp to smoothly interpolate between lane positions stored in a float array (−325, 0, 325). This keeps the lane change snappy but not teleport-y. After that, I jump into BP_Floor and increase difficulty over time by multiplying Max Walk Speed by 1.001, clamping it (like 700 to 1500/1700), and setting it back on the Character Movement component. You can visualize it with Print String, and you should be careful not to push the max speed too high.