games-action/rrootage-0.23a should be marked stable on amd64. I have been playing it for a few weeks now and have not experienced any problems. I have played with both monolithic and modular X.org both of which worked perfectly fine. It has been in the tree for more than one month and there are no open bug reports (that I could find) relating to this package.
Forgot to include emerge --info output. Gentoo Base System version 1.12.0 Portage 2.1_rc3-r2 (default-linux/amd64/2006.0, gcc-3.4.5, glibc-2.3.6-r3, 2.6.16-gentoo-r7 x86_64) ================================================================= System uname: 2.6.16-gentoo-r7 x86_64 AMD Athlon(tm) 64 Processor 3000+ dev-lang/python: 2.4.2 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: [Not Present] dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1 sys-devel/binutils: 2.16.1-r2 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="amd64" AUTOCLEAN="yes" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=athlon64 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/gconf /etc/env.d" CXXFLAGS="-O2 -march=athlon64 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" SYNC="rsync://rsync.au.gentoo.org/gentoo-portage" USE="amd64 X aac alsa arts avi bash-completion berkdb bitmap-fonts bzip2 caps cjk cli crypt dri dts dvb dvd dvdr eds emboss encode exif flac foomaticdb fortran gif glut gpm gtk gtk2 hal idn ieee1394 imlib ipv6 isdnlog java jpeg kde kdeenablefinal lm_sensors lzw lzw-tiff mad mikmod mp3 mpeg ncurses nls nptl nsplugin offensive ogg opengl pam pcre pdflib perl png pppd python qt quicktime readline reflection sasl sdl session spell spl ssl tcpd truetype truetype-fonts type1-fonts unicode usb vorbis xml xorg xpm xv zlib elibc_glibc input_devices_keyboard input_devices_mouse kernel_linux userland_GNU video_cards_nv video_cards_nvidia" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, LDFLAGS, LINGUAS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY
took me a while to find out how this game works, but yeah, it seems to work ;) thanks for letting us know