diff --git a/cmd/mothd/httpd.go b/cmd/mothd/httpd.go
index a31c2da..66eb6f4 100644
--- a/cmd/mothd/httpd.go
+++ b/cmd/mothd/httpd.go
@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/dirtbags/moth/pkg/jsend"
 )
@@ -29,6 +30,10 @@ func NewHTTPServer(base string, server *MothServer) *HTTPServer {
 	h.HandleMothFunc("/register", h.RegisterHandler)
 	h.HandleMothFunc("/answer", h.AnswerHandler)
 	h.HandleMothFunc("/content/", h.ContentHandler)
+
+	if server.Config.Devel {
+		h.HandleMothFunc("/mothballer/", h.MothballerHandler)
+	}
 	return h
 }
 
@@ -128,16 +133,16 @@ func (h *HTTPServer) AnswerHandler(mh MothRequestHandler, w http.ResponseWriter,
 
 // ContentHandler returns static content from a given puzzle
 func (h *HTTPServer) ContentHandler(mh MothRequestHandler, w http.ResponseWriter, req *http.Request) {
-	trimLen := len(h.base) + len("/content/")
-	parts := strings.SplitN(req.URL.Path[trimLen:], "/", 3)
-	if len(parts) < 3 {
-		http.Error(w, "Not Found", http.StatusNotFound)
+	parts := strings.SplitN(req.URL.Path[len(h.base)+1:], "/", 4)
+	if len(parts) < 4 {
+		http.NotFound(w, req)
 		return
 	}
 
-	cat := parts[0]
-	pointsStr := parts[1]
-	filename := parts[2]
+	// parts[0] == "content"
+	cat := parts[1]
+	pointsStr := parts[2]
+	filename := parts[3]
 
 	if filename == "" {
 		filename = "puzzle.json"
@@ -154,3 +159,23 @@ func (h *HTTPServer) ContentHandler(mh MothRequestHandler, w http.ResponseWriter
 
 	http.ServeContent(w, req, filename, mtime, mf)
 }
+
+// MothballerHandler returns a mothball
+func (h *HTTPServer) MothballerHandler(mh MothRequestHandler, w http.ResponseWriter, req *http.Request) {
+	parts := strings.SplitN(req.URL.Path[len(h.base)+1:], "/", 2)
+	if len(parts) < 2 {
+		http.NotFound(w, req)
+		return
+	}
+
+	// parts[0] == "mothballer"
+	filename := parts[1]
+	cat := strings.TrimSuffix(filename, ".mb")
+	mothball, err := mh.Mothball(cat)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	http.ServeContent(w, req, filename, time.Now(), mothball)
+}
diff --git a/cmd/mothd/httpd_test.go b/cmd/mothd/httpd_test.go
index 70be3c7..6bd66dc 100644
--- a/cmd/mothd/httpd_test.go
+++ b/cmd/mothd/httpd_test.go
@@ -8,6 +8,8 @@ import (
 	"net/url"
 	"testing"
 	"time"
+
+	"github.com/spf13/afero"
 )
 
 const TestParticipantID = "shipox"
@@ -123,3 +125,39 @@ func TestHttpd(t *testing.T) {
 		t.Error("Unexpected body", r.Body.String())
 	}
 }
+
+func TestDevelMemHttpd(t *testing.T) {
+	srv := NewTestServer()
+
+	{
+		hs := NewHTTPServer("/", srv)
+
+		if r := hs.TestRequest("/mothballer/pategory.md", nil); r.Result().StatusCode != 404 {
+			t.Error("Should have gotten a 404 for mothballer in prod mode")
+		}
+	}
+
+	{
+		srv.Config.Devel = true
+		hs := NewHTTPServer("/", srv)
+
+		if r := hs.TestRequest("/mothballer/pategory.md", nil); r.Result().StatusCode != 500 {
+			t.Log(r.Body.String())
+			t.Log(r.Result())
+			t.Error("Should have given us an internal server error, since category is a mothball")
+		}
+	}
+}
+
+func TestDevelFsHttps(t *testing.T) {
+	fs := afero.NewBasePathFs(afero.NewOsFs(), "testdata")
+	transpilerProvider := NewTranspilerProvider(fs)
+	srv := NewMothServer(Configuration{Devel: true}, NewTestTheme(), NewTestState(), transpilerProvider)
+	hs := NewHTTPServer("/", srv)
+
+	if r := hs.TestRequest("/mothballer/cat0.mb", nil); r.Result().StatusCode != 200 {
+		t.Log(r.Body.String())
+		t.Log(r.Result())
+		t.Error("Didn't get a Mothball")
+	}
+}
diff --git a/cmd/mothd/main.go b/cmd/mothd/main.go
index 718348b..61bb823 100644
--- a/cmd/mothd/main.go
+++ b/cmd/mothd/main.go
@@ -2,7 +2,9 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"mime"
+	"os"
 	"time"
 
 	"github.com/spf13/afero"
@@ -44,8 +46,22 @@ func main() {
 		"/",
 		"Base URL of this instance",
 	)
+	seed := flag.String(
+		"seed",
+		"",
+		"Random seed to use, overrides $SEED",
+	)
 	flag.Parse()
 
+	// Set random seed
+	if *seed == "" {
+		*seed = os.Getenv("SEED")
+	}
+	if *seed == "" {
+		*seed = fmt.Sprintf("%d%d", os.Getpid(), time.Now().Unix())
+	}
+	os.Setenv("SEED", *seed)
+
 	osfs := afero.NewOsFs()
 	theme := NewTheme(afero.NewBasePathFs(osfs, *themePath))
 	state := NewState(afero.NewBasePathFs(osfs, *statePath))
diff --git a/cmd/mothd/mothballs.go b/cmd/mothd/mothballs.go
index e78e3c0..deab589 100644
--- a/cmd/mothd/mothballs.go
+++ b/cmd/mothd/mothballs.go
@@ -3,6 +3,7 @@ package main
 import (
 	"archive/zip"
 	"bufio"
+	"bytes"
 	"fmt"
 	"io"
 	"log"
@@ -172,6 +173,11 @@ func (m *Mothballs) refresh() {
 	}
 }
 
+// Mothball just returns an error
+func (m *Mothballs) Mothball(cat string) (*bytes.Reader, error) {
+	return nil, fmt.Errorf("Can't repackage a compiled mothball")
+}
+
 // Maintain performs housekeeping for Mothballs.
 func (m *Mothballs) Maintain(updateInterval time.Duration) {
 	m.refresh()
diff --git a/cmd/mothd/providercommand.go b/cmd/mothd/providercommand.go
index 1af9766..75e46b8 100644
--- a/cmd/mothd/providercommand.go
+++ b/cmd/mothd/providercommand.go
@@ -4,6 +4,7 @@ package main
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"io"
 	"log"
 	"os"
@@ -122,6 +123,11 @@ func (pc ProviderCommand) CheckAnswer(cat string, points int, answer string) (bo
 	return true, nil
 }
 
+// Mothball just returns an error
+func (pc ProviderCommand) Mothball(cat string) (*bytes.Reader, error) {
+	return nil, fmt.Errorf("Can't package a command-generated category")
+}
+
 // Maintain does nothing: a command puzzle ProviderCommand has no housekeeping
 func (pc ProviderCommand) Maintain(updateInterval time.Duration) {
 }
diff --git a/cmd/mothd/server.go b/cmd/mothd/server.go
index 781f7c1..a355cf7 100644
--- a/cmd/mothd/server.go
+++ b/cmd/mothd/server.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"strconv"
@@ -41,6 +42,7 @@ type PuzzleProvider interface {
 	Open(cat string, points int, path string) (ReadSeekCloser, time.Time, error)
 	Inventory() []Category
 	CheckAnswer(cat string, points int, answer string) (bool, error)
+	Mothball(cat string) (*bytes.Reader, error)
 	Maintainer
 }
 
@@ -229,3 +231,16 @@ func (mh *MothRequestHandler) ExportState() *StateExport {
 
 	return &export
 }
+
+// Mothball generates a mothball for the given category.
+func (mh *MothRequestHandler) Mothball(cat string) (r *bytes.Reader, err error) {
+	if !mh.Config.Devel {
+		return nil, fmt.Errorf("Cannot mothball in production mode")
+	}
+	for _, provider := range mh.PuzzleProviders {
+		if r, err = provider.Mothball(cat); err == nil {
+			return r, nil
+		}
+	}
+	return nil, err
+}
diff --git a/cmd/mothd/transpiler.go b/cmd/mothd/transpiler.go
index 042e213..ddda86b 100644
--- a/cmd/mothd/transpiler.go
+++ b/cmd/mothd/transpiler.go
@@ -69,6 +69,12 @@ func (p TranspilerProvider) CheckAnswer(cat string, points int, answer string) (
 	return c.Answer(points, answer), nil
 }
 
+// Mothball packages up a category into a mothball.
+func (p TranspilerProvider) Mothball(cat string) (*bytes.Reader, error) {
+	c := transpile.NewFsCategory(p.fs, cat)
+	return transpile.Mothball(c)
+}
+
 // Maintain performs housekeeping.
 func (p TranspilerProvider) Maintain(updateInterval time.Duration) {
 	// Nothing to do here.
diff --git a/pkg/transpile/common_test.go b/pkg/transpile/common_test.go
index c838fc1..c2c9d94 100644
--- a/pkg/transpile/common_test.go
+++ b/pkg/transpile/common_test.go
@@ -13,7 +13,7 @@ pre:
     - Buster
     - DW
   attachments:
-    - filename: moo.txt
+    - moo.txt
 ---
 YAML body
 `)
diff --git a/pkg/transpile/puzzle.go b/pkg/transpile/puzzle.go
index ed5d433..ff9c2e2 100644
--- a/pkg/transpile/puzzle.go
+++ b/pkg/transpile/puzzle.go
@@ -92,6 +92,26 @@ type StaticAttachment struct {
 	FilesystemPath string // Filename in backing FS (URL, mothball, or local FS)
 }
 
+// UnmarshalYAML allows a StaticAttachment to be specified as a single string.
+// The way the yaml library works is weird.
+func (sa *StaticAttachment) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	if err := unmarshal(&sa.Filename); err == nil {
+		sa.FilesystemPath = sa.Filename
+		return nil
+	}
+
+	parts := new(struct {
+		Filename       string
+		FilesystemPath string
+	})
+	if err := unmarshal(parts); err != nil {
+		return err
+	}
+	sa.Filename = parts.Filename
+	sa.FilesystemPath = parts.FilesystemPath
+	return nil
+}
+
 // ReadSeekCloser provides io.Reader, io.Seeker, and io.Closer.
 type ReadSeekCloser interface {
 	io.Reader
@@ -307,8 +327,16 @@ func rfc822HeaderParser(r io.Reader) (StaticPuzzle, error) {
 			p.Debug.Summary = val[0]
 		case "hint":
 			p.Debug.Hints = val
+		case "solution":
+			p.Debug.Hints = val
 		case "ksa":
 			p.Post.KSAs = val
+		case "objective":
+			p.Post.Objective = val[0]
+		case "success.acceptable":
+			p.Post.Success.Acceptable = val[0]
+		case "success.mastery":
+			p.Post.Success.Mastery = val[0]
 		default:
 			return p, fmt.Errorf("Unknown header field: %s", key)
 		}
diff --git a/pkg/transpile/puzzle_test.go b/pkg/transpile/puzzle_test.go
index 288cde5..a6fc813 100644
--- a/pkg/transpile/puzzle_test.go
+++ b/pkg/transpile/puzzle_test.go
@@ -136,3 +136,35 @@ func TestFsPuzzle(t *testing.T) {
 		t.Error("Error answer marked correct")
 	}
 }
+
+func TestAttachment(t *testing.T) {
+	buf := bytes.NewBufferString(`
+pre:
+  attachments: 
+    - simple
+    - filename: complex
+      filesystempath: backingfile
+`)
+	p, err := yamlHeaderParser(buf)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	att := p.Pre.Attachments
+	if len(att) != 2 {
+		t.Error("Wrong number of attachments", att)
+	}
+	if att[0].Filename != "simple" {
+		t.Error("Attachment 0 wrong")
+	}
+	if att[0].Filename != att[0].FilesystemPath {
+		t.Error("Attachment 0 wrong")
+	}
+	if att[1].Filename != "complex" {
+		t.Error("Attachment 1 wrong")
+	}
+	if att[1].FilesystemPath != "backingfile" {
+		t.Error("Attachment 2 wrong")
+	}
+}