Rewind GUI Script

-- Stolen from 0Ben1, check him out. https://github.com/0Ben1
local flashbacklength = 60 -- how long the flashback should be stored in approx seconds
local flashbackspeed = 1 -- how many frames to skip during flashback (set to 0 to disable)

local name = game:GetService("RbxAnalyticsService"):GetSessionId() -- unique id that games cannot access but does not change on subsequent executions (used for the name of the binded function)
local frames, LP, RS = {}, game:GetService("Players").LocalPlayer, game:GetService("RunService") -- set some vars

pcall(RS.UnbindFromRenderStep, RS, name) -- unbind the function if previously binded

local function getchar()
   return LP.Character or LP.CharacterAdded:Wait()
end

function gethrp(c) -- gethrp ripped from my env script and stripped of arguments
return c:FindFirstChild("HumanoidRootPart") or c.RootPart or c.PrimaryPart or c:FindFirstChild("Torso") or c:FindFirstChild("UpperTorso") or c:FindFirstChildWhichIsA("BasePart")
end

local flashback = {lastinput=false, canrevert=true}

function flashback:Advance(char, hrp, hum, allowinput)
   
   if #frames>flashbacklength*60 then -- make sure we don't have too much history
       table.remove(frames, 1)
   end
   
   if allowinput and not self.canrevert then
       self.canrevert = true
   end
   
   if self.lastinput then -- make sure platformstand goes back to normal
       hum.PlatformStand = false
       self.lastinput = false
   end
   
   table.insert(frames, {
       hrp.CFrame,
       hrp.Velocity,
       hum:GetState(),
       hum.PlatformStand,
       char:FindFirstChildOfClass("Tool")