game.py: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/share/games/oneisenough/bin/game.py - from package: oneisenough

You may install the required package with command apt-get install {package}

Error in other languages:
game.py: bevel nie gevind nie
game.py: comandă negăsită
game.py: comando não encontrado
game.py: commande introuvable
game.py: command not found
game.py: käsku ei ole
game.py: không tìm thấy lệnh
game.py: komanda nerasta
game.py: Kommando nicht gefunden.
game.py: kommandot finns inte
game.py: komut yok
game.py: nie znaleziono polecenia
game.py: níor aimsíodh an t-ordú
game.py: no se encontró la orden
game.py: no s'ha trobat l'ordre
game.py: opdracht niet gevonden
game.py: parancs nem található
game.py: perintah tidak ditemukan
game.py: príkaz nenájdený
game.py: příkaz nenalezen
game.py: команда не найдена
game.py: командата не е открита
game.py: 命令找不到
game.py: コマンドが見つかりません