@echo off
call :barra t . "Vida restante"
ping -n 2 logalhost >nul
:ini
cls
set n1=%random:~0,3%
ping -n 0,5 logalhost >nul
set n2=%random:~0,3%
ping -n 0,5 logalhost >nul
set /a resu=%n1%+%n2%
set /p "Soma=A soma de %n1% + %n2%= ? >: "
if %Soma%==%resu% (call :barra + 2 "Resposta certa") else (call :barra - 2 "Resposta errada")
ping -n 2 logalhost >nul
goto :ini


:barra
setlocal enabledelayedexpansion
if exist t.txt ( set /p tot=<t.txt ) else ( set tot=79 )
if "%1"=="T" ( goto segue ) else (
if %1==+ ( set /a tot=%tot%+%2 )
if %1==- ( set /a tot=%tot%-%2 )
)
:segue
color 0A
set i=30
FOR /l %%a in (30,1,79) do set j=!j!²
FOR /l %%a in (30,1,79) do set j=!j!
Echo  %~3
(Set /P j=!j!) < NUL
:startshow
call :show %i%
:put
set /a i = i + 1
if /i %i% leq %tot% goto startshow
echo %tot%>t.txt
endlocal
ECHO.
goto :EOF
:show
set /a p=(%1*100)/79
title  !p!%% de vida restante
(Set /P j=Û) < NUL
exit /b