hwengine: 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/lib/hedgewars/bin/hwengine - from package: hedgewars

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

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