A (so far nicely working) attempt to throw Teeworlds into OS X's native sandbox. Rename teeworld's executable to teeworlds-orig and save this script in its original location, then make it executable.

teeworlds.sh

#!/bin/sh
# Teeworlds sandboxing script
# Oliver Kuckertz <oliver.kucertz@mologie.de>, 2013-10-11, public domain

abspath() {
	echo "$(cd $1; pwd)"
}
absdirname() {
	echo "$(abspath $(dirname $1))"
}

BIN_PATH="$(absdirname $0)"
BUNDLE_PATH="$(abspath $BIN_PATH/../..)"
TEEWORLDS_BIN="$BIN_PATH/teeworlds-orig"

read -d '' RULES<<EOF
;; teeworlds - sandbox profile
;; Oliver Kuckertz <oliver.kucertz@mologie.de>, 2013-10-11, public domain

(version 1)
(import "bsd.sb")

;; By default, deny all requests, and log denied requets to system.log
(deny default)
(debug deny)

;; Permit using sockets and allow connecting and binding to any address
(allow system-socket)
(allow network*)

;; Allow executing the teeworlds executable
(allow process-exec (literal "$TEEWORLDS_BIN"))

;; Permit write access to the teeworlds profile directory
(allow file*
	(subpath "/Users/$USER/Library/Application Support/Teeworlds"))
	
;; Permit read access to the bundle itself, a set of preference files and all MacPorts system libraries
(allow file-read*
	(subpath "$BUNDLE_PATH")
	(literal "/private/etc/hosts")
	(subpath "/opt/local/lib")
	(literal "/Library/Preferences/.GlobalPreferences.plist")
	(subpath "/Library/Audio/Plug-Ins/HAL")
	(subpath "/Users/$USER/Library/Keyboard Layouts")
	(subpath "/Users/$USER/Library/Input Methods")
	(literal "/Users/$USER/Library/Preferences/.GlobalPreferences.plist")
	(regex "^/Users/$USER/Library/Preferences/ByHost/.GlobalPreferences\\..+\\.plist$")
	(literal "/Users/$USER/Library/Preferences/com.apple.speech.recognition.AppleSpeechRecognition.prefs.plist")
	(subpath "/Users/$USER/Library/Autosave Information"))

;; Permit using the following interfaces
(allow iokit-open
	(iokit-user-client-class "RootDomainUserClient")
	(iokit-user-client-class "IOAudioEngineUserClient"))

;; Permit communicating with the following services
(allow mach-lookup
	(global-name "com.apple.audio.coreaudiod")
	(global-name "com.apple.audio.audiohald")
	(global-name "com.apple.CoreServices.coreservicesd")
	(global-name "com.apple.coreservices.appleevents")
	(global-name "com.apple.coresymbolicationd")
	(global-name "com.apple.distributed_notifications@Uv3")
	(global-name "com.apple.dock.server")
	(global-name "com.apple.FontServer")
	(global-name "com.apple.FontObjectsServer")
	(global-name "com.apple.pasteboard.1")
	(global-name "com.apple.networkd")
	(global-name "com.apple.tsm.uiserver")
	(global-name "com.apple.window_proxies")
	(global-name "com.apple.windowserver.active"))

;; Silently deny access to the following classes
(deny iokit-open
	(iokit-user-client-class "IOHIDParamUserClient")(with no-log))

;; Permit access to graphic hardware and services
(system-graphics)
EOF
sandbox-exec -p "$RULES" "$BIN_PATH/teeworlds-orig" "$@"