Just playing with Sudoku (well the JWildfire variation anyway)..
<flame name="Into The Blue - M Bourne 2020" smooth_gradient="0" version="JWildfire V5.50 (21.12.2019)" size="1024 768" center="0.0 0.0" scale="463.5206551754969" rotate="-89.0" filter="0.75" filter_type="GLOBAL_SHARPENING" filter_kernel="MITCHELL" filter_indicator="0" filter_sharpness="4.0" filter_low_density="0.025" oversample="1" post_noise_filter="0" post_noise_filter_threshold="0.35" quality="1000.0" background_type="SINGLE_COLOR" background="0.0 0.0 0.0" bg_transparency="0" fg_opacity="1.0" brightness="8.74" saturation="1.2" gamma="2.95" gamma_threshold="0.001" vibrancy="1.0" contrast="1.0" white_level="172.0" temporal_samples="1.0" cam_zoom="0.705" cam_pitch="0.06981317007977318" cam_yaw="0.0" cam_roll="0.0" cam_persp="0.0" cam_xfocus="0.0" cam_yfocus="0.0" cam_zfocus="0.0" cam_pos_x="0.0" cam_pos_y="0.0" cam_pos_z="0.0" cam_zpos="0.0" cam_dof="0.0" cam_dof_area="0.5" cam_dof_exponent="2.0" low_density_brightness="0.24" balancing_red="1.0" balancing_green="1.0" balancing_blue="1.0" cam_dof_shape="BUBBLE" cam_dof_scale="1.0" cam_dof_rotate="0.0" cam_dof_fade="1.0" resolution_profile="1024x768" antialias_amount="0.0" antialias_radius="0.5" post_symmetry_type="X_AXIS" post_symmetry_order="3" post_symmetry_centre_x="0.0" post_symmetry_centre_y="0.0" post_symmetry_distance="-0.05" post_symmetry_rotation="0.0" frame="1" frame_count="300" fps="30" post_blur_radius="0" post_blur_fade="0.95" post_blur_falloff="2.0" zbuffer_scale="1.0" zbuffer_bias="0.0" zbuffer_filename="PRE_ZBUF" mixer_mode="OFF" grad_edit_hue_curve_enabled="false" grad_edit_hue_curve_view_xmin="-5" grad_edit_hue_curve_view_xmax="260" grad_edit_hue_curve_view_ymin="-5.0" grad_edit_hue_curve_view_ymax="260.0" grad_edit_hue_curve_interpolation="SPLINE" grad_edit_hue_curve_selected_idx="0" grad_edit_hue_curve_locked="false" grad_edit_hue_curve_point_count="12" grad_edit_hue_curve_x0="0" grad_edit_hue_curve_y0="150.768156424581" grad_edit_hue_curve_x1="23" grad_edit_hue_curve_y1="150.3846153846154" grad_edit_hue_curve_x2="46" grad_edit_hue_curve_y2="151.03846153846155" grad_edit_hue_curve_x3="70" grad_edit_hue_curve_y3="150.94827586206895" grad_edit_hue_curve_x4="93" grad_edit_hue_curve_y4="150.7788944723618" grad_edit_hue_curve_x5="116" grad_edit_hue_curve_y5="150.94827586206895" grad_edit_hue_curve_x6="139" grad_edit_hue_curve_y6="150.875" grad_edit_hue_curve_x7="162" grad_edit_hue_curve_y7="150.88516746411486" grad_edit_hue_curve_x8="185" grad_edit_hue_curve_y8="150.91836734693877" grad_edit_hue_curve_x9="209" grad_edit_hue_curve_y9="151.03846153846155" grad_edit_hue_curve_x10="232" grad_edit_hue_curve_y10="150.57142857142858" grad_edit_hue_curve_x11="255" grad_edit_hue_curve_y11="150.8988764044944" grad_edit_saturation_curve_enabled="false" grad_edit_saturation_curve_view_xmin="-5" grad_edit_saturation_curve_view_xmax="260" grad_edit_saturation_curve_view_ymin="-5.0" grad_edit_saturation_curve_view_ymax="260.0" grad_edit_saturation_curve_interpolation="SPLINE" grad_edit_saturation_curve_selected_idx="0" grad_edit_saturation_curve_locked="false" grad_edit_saturation_curve_point_count="12" grad_edit_saturation_curve_x0="0" grad_edit_saturation_curve_y0="238.97905759162305" grad_edit_saturation_curve_x1="23" grad_edit_saturation_curve_y1="41.96202531645569" grad_edit_saturation_curve_x2="46" grad_edit_saturation_curve_y2="99.25149700598801" grad_edit_saturation_curve_x3="70" grad_edit_saturation_curve_y3="176.91387559808612" grad_edit_saturation_curve_x4="93" grad_edit_saturation_curve_y4="200.57312252964428" grad_edit_saturation_curve_x5="116" grad_edit_saturation_curve_y5="199.86486486486496" grad_edit_saturation_curve_x6="139" grad_edit_saturation_curve_y6="248.78048780487808" grad_edit_saturation_curve_x7="162" grad_edit_saturation_curve_y7="210.65217391304347" grad_edit_saturation_curve_x8="185" grad_edit_saturation_curve_y8="177.65402843601896" grad_edit_saturation_curve_x9="209" grad_edit_saturation_curve_y9="99.25149700598801" grad_edit_saturation_curve_x10="232" grad_edit_saturation_curve_y10="79.68749999999999" grad_edit_saturation_curve_x11="255" grad_edit_saturation_curve_y11="238.89473684210526" grad_edit_luminosity_curve_enabled="false" grad_edit_luminosity_curve_view_xmin="-5" grad_edit_luminosity_curve_view_xmax="260" grad_edit_luminosity_curve_view_ymin="-5.0" grad_edit_luminosity_curve_view_ymax="260.0" grad_edit_luminosity_curve_interpolation="SPLINE" grad_edit_luminosity_curve_selected_idx="0" grad_edit_luminosity_curve_locked="false" grad_edit_luminosity_curve_point_count="12" grad_edit_luminosity_curve_x0="0" grad_edit_luminosity_curve_y0="159.5" grad_edit_luminosity_curve_x1="23" grad_edit_luminosity_curve_y1="79.0" grad_edit_luminosity_curve_x2="46" grad_edit_luminosity_curve_y2="83.5" grad_edit_luminosity_curve_x3="70" grad_edit_luminosity_curve_y3="104.5" grad_edit_luminosity_curve_x4="93" grad_edit_luminosity_curve_y4="128.5" grad_edit_luminosity_curve_x5="116" grad_edit_luminosity_curve_y5="218.00000000000003" grad_edit_luminosity_curve_x6="139" grad_edit_luminosity_curve_y6="122.99999999999999" grad_edit_luminosity_curve_x7="162" grad_edit_luminosity_curve_y7="126.5" grad_edit_luminosity_curve_x8="185" grad_edit_luminosity_curve_y8="105.5" grad_edit_luminosity_curve_x9="209" grad_edit_luminosity_curve_y9="83.5" grad_edit_luminosity_curve_x10="232" grad_edit_luminosity_curve_y10="112.0" grad_edit_luminosity_curve_x11="255" grad_edit_luminosity_curve_y11="160.0"> <xform weight="0.5" color_type="DIFFUSION" color="0.89243" symmetry="-0.62" mirror_pre_post_translations="0" material="0.0" material_speed="0.0" mod_gamma="0.0" mod_gamma_speed="0.0" mod_contrast="0.0" mod_contrast_speed="0.0" mod_saturation="0.0" mod_saturation_speed="0.0" mod_hue="0.0" mod_hue_speed="0.0" linear3D="1.0" linear3D_fx_priority="0" coefs="0.8846252092006267 0.0 0.0 1.0 0.0 -0.0865563477587008" chaos="0.0 0.0 1.0"/> <xform weight="0.5" color_type="DIFFUSION" color="0.82209" symmetry="0.0" mirror_pre_post_translations="0" material="0.0" material_speed="0.0" mod_gamma="0.0" mod_gamma_speed="0.0" mod_contrast="0.0" mod_contrast_speed="0.0" mod_saturation="0.0" mod_saturation_speed="0.0" mod_hue="0.0" mod_hue_speed="0.0" opacity="0.0" flipy="9.0" flipy_fx_priority="0" coefs="-0.9995980958646902 0.00628994971680866 -2.4978021179329496E-16 -1.0198051061220332 1.0899093308697791 0.1165534779948062" post="-1.0 0.0 -0.0 1.0 0.0 0.0" chaos="0.0 1.0 1.0"/> <xform weight="0.5" color_type="DIFFUSION" color="0.0" symmetry="0.0" mirror_pre_post_translations="0" material="0.0" material_speed="0.0" mod_gamma="0.0" mod_gamma_speed="0.0" mod_contrast="0.0" mod_contrast_speed="0.0" mod_saturation="0.0" mod_saturation_speed="0.0" mod_hue="0.0" mod_hue_speed="0.0" nsudoku="3.08304291" nsudoku_fx_priority="0" nsudoku_Level="5" nsudoku_thickness="0.5" nsudoku_size="0.5" nsudoku_angle="0.0" nsudoku_type="4" coefs="0.999920353932068 0.012620847529761984 -0.012620847529761984 0.999920353932068 0.061983471074380514 1.1019283746556479" chaos="1.0 1.0 1.0"/> <finalxform weight="0.0" color_type="NONE" color="0.0" symmetry="0.0" mirror_pre_post_translations="0" material="0.0" material_speed="0.0" mod_gamma="0.0" mod_gamma_speed="0.0" mod_contrast="0.0" mod_contrast_speed="0.0" mod_saturation="0.0" mod_saturation_speed="0.0" mod_hue="0.0" mod_hue_speed="0.0" cos="1.0" cos_fx_priority="0" coefs="1.0 0.0 0.0 1.0 0.0 0.0" chaos="1.0 1.0 1.0"/> <finalxform weight="0.0" color_type="NONE" color="0.0" symmetry="0.0" mirror_pre_post_translations="0" material="0.0" material_speed="0.0" mod_gamma="0.0" mod_gamma_speed="0.0" mod_contrast="0.0" mod_contrast_speed="0.0" mod_saturation="0.0" mod_saturation_speed="0.0" mod_hue="0.0" mod_hue_speed="0.0" circlize2="1.0" circlize2_fx_priority="0" circlize2_hole="0.0" coefs="1.0 0.0 0.0 1.0 0.0 0.0" chaos="1.0 1.0 1.0"/> <palette count="256" format="RGB"> 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